Update upstream source from tag 'upstream/8.1.2'

Update to upstream version '8.1.2'
with Debian dir e5e966a9e6010ef70618dc9a61558fa4db35aceb

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+<p align="center">
+  <a href="https://getbootstrap.com/">
+    <img src="https://getbootstrap.com/docs/4.5/assets/brand/bootstrap-solid.svg" alt="Bootstrap logo" width="72" height="72">
+  </a>
+</p>
+
+<h3 align="center">Bootstrap</h3>
+
+<p align="center">
+  Sleek, intuitive, and powerful front-end framework for faster and easier web development.
+  <br>
+  <a href="https://getbootstrap.com/docs/4.5/"><strong>Explore Bootstrap docs »</strong></a>
+  <br>
+  <br>
+  <a href="https://github.com/twbs/bootstrap/issues/new?template=bug_report.md">Report bug</a>
+  ·
+  <a href="https://github.com/twbs/bootstrap/issues/new?template=feature_request.md">Request feature</a>
+  ·
+  <a href="https://themes.getbootstrap.com/">Themes</a>
+  ·
+  <a href="https://blog.getbootstrap.com/">Blog</a>
+</p>
+
+
+## Table of contents
+
+- [Quick start](#quick-start)
+- [Status](#status)
+- [What's included](#whats-included)
+- [Bugs and feature requests](#bugs-and-feature-requests)
+- [Documentation](#documentation)
+- [Contributing](#contributing)
+- [Community](#community)
+- [Versioning](#versioning)
+- [Creators](#creators)
+- [Thanks](#thanks)
+- [Copyright and license](#copyright-and-license)
+
+
+## Quick start
+
+Several quick start options are available:
+
+- [Download the latest release.](https://github.com/twbs/bootstrap/archive/v4.5.3.zip)
+- Clone the repo: `git clone https://github.com/twbs/bootstrap.git`
+- Install with [npm](https://www.npmjs.com/): `npm install bootstrap`
+- Install with [yarn](https://yarnpkg.com/): `yarn add bootstrap@4.5.3`
+- Install with [Composer](https://getcomposer.org/): `composer require twbs/bootstrap:4.5.3`
+- Install with [NuGet](https://www.nuget.org/): CSS: `Install-Package bootstrap` Sass: `Install-Package bootstrap.sass`
+
+Read the [Getting started page](https://getbootstrap.com/docs/4.5/getting-started/introduction/) for information on the framework contents, templates and examples, and more.
+
+
+## Status
+
+[![Slack](https://bootstrap-slack.herokuapp.com/badge.svg)](https://bootstrap-slack.herokuapp.com/)
+[![Build Status](https://github.com/twbs/bootstrap/workflows/JS%20Tests/badge.svg?branch=v4-dev)](https://github.com/twbs/bootstrap/actions?query=workflow%3AJS+Tests+branch%3Av4-dev)
+[![npm version](https://img.shields.io/npm/v/bootstrap)](https://www.npmjs.com/package/bootstrap)
+[![Gem version](https://img.shields.io/gem/v/bootstrap)](https://rubygems.org/gems/bootstrap)
+[![Meteor Atmosphere](https://img.shields.io/badge/meteor-twbs%3Abootstrap-blue)](https://atmospherejs.com/twbs/bootstrap)
+[![Packagist Prerelease](https://img.shields.io/packagist/vpre/twbs/bootstrap)](https://packagist.org/packages/twbs/bootstrap)
+[![NuGet](https://img.shields.io/nuget/vpre/bootstrap)](https://www.nuget.org/packages/bootstrap/absoluteLatest)
+[![peerDependencies Status](https://img.shields.io/david/peer/twbs/bootstrap)](https://david-dm.org/twbs/bootstrap?type=peer)
+[![devDependency Status](https://img.shields.io/david/dev/twbs/bootstrap)](https://david-dm.org/twbs/bootstrap?type=dev)
+[![Coverage Status](https://img.shields.io/coveralls/github/twbs/bootstrap/v4-dev)](https://coveralls.io/github/twbs/bootstrap?branch=v4-dev)
+[![CSS gzip size](https://img.badgesize.io/twbs/bootstrap/v4-dev/dist/css/bootstrap.min.css?compression=gzip&label=CSS%20gzip%20size)](https://github.com/twbs/bootstrap/blob/v4-dev/dist/css/bootstrap.min.css)
+[![JS gzip size](https://img.badgesize.io/twbs/bootstrap/v4-dev/dist/js/bootstrap.min.js?compression=gzip&label=JS%20gzip%20size)](https://github.com/twbs/bootstrap/blob/v4-dev/dist/js/bootstrap.min.js)
+[![BrowserStack Status](https://www.browserstack.com/automate/badge.svg?badge_key=SkxZcStBeExEdVJqQ2hWYnlWckpkNmNEY213SFp6WHFETWk2bGFuY3pCbz0tLXhqbHJsVlZhQnRBdEpod3NLSDMzaHc9PQ==--3d0b75245708616eb93113221beece33e680b229)](https://www.browserstack.com/automate/public-build/SkxZcStBeExEdVJqQ2hWYnlWckpkNmNEY213SFp6WHFETWk2bGFuY3pCbz0tLXhqbHJsVlZhQnRBdEpod3NLSDMzaHc9PQ==--3d0b75245708616eb93113221beece33e680b229)
+[![Backers on Open Collective](https://img.shields.io/opencollective/backers/bootstrap)](#backers)
+[![Sponsors on Open Collective](https://img.shields.io/opencollective/sponsors/bootstrap)](#sponsors)
+
+
+## What's included
+
+Within the download you'll find the following directories and files, logically grouping common assets and providing both compiled and minified variations. You'll see something like this:
+
+```text
+bootstrap/
+└── dist/
+    ├── css/
+    │   ├── bootstrap-grid.css
+    │   ├── bootstrap-grid.css.map
+    │   ├── bootstrap-grid.min.css
+    │   ├── bootstrap-grid.min.css.map
+    │   ├── bootstrap-reboot.css
+    │   ├── bootstrap-reboot.css.map
+    │   ├── bootstrap-reboot.min.css
+    │   ├── bootstrap-reboot.min.css.map
+    │   ├── bootstrap.css
+    │   ├── bootstrap.css.map
+    │   ├── bootstrap.min.css
+    │   └── bootstrap.min.css.map
+    └── js/
+        ├── bootstrap.bundle.js
+        ├── bootstrap.bundle.js.map
+        ├── bootstrap.bundle.min.js
+        ├── bootstrap.bundle.min.js.map
+        ├── bootstrap.js
+        ├── bootstrap.js.map
+        ├── bootstrap.min.js
+        └── bootstrap.min.js.map
+```
+
+We provide compiled CSS and JS (`bootstrap.*`), as well as compiled and minified CSS and JS (`bootstrap.min.*`). [source maps](https://developers.google.com/web/tools/chrome-devtools/javascript/source-maps) (`bootstrap.*.map`) are available for use with certain browsers' developer tools. Bundled JS files (`bootstrap.bundle.js` and minified `bootstrap.bundle.min.js`) include [Popper](https://popper.js.org/), but not [jQuery](https://jquery.com/).
+
+
+## Bugs and feature requests
+
+Have a bug or a feature request? Please first read the [issue guidelines](https://github.com/twbs/bootstrap/blob/v4-dev/.github/CONTRIBUTING.md#using-the-issue-tracker) and search for existing and closed issues. If your problem or idea is not addressed yet, [please open a new issue](https://github.com/twbs/bootstrap/issues/new).
+
+
+## Documentation
+
+Bootstrap's documentation, included in this repo in the root directory, is built with [Jekyll](https://jekyllrb.com/) and publicly hosted on GitHub Pages at <https://getbootstrap.com/>. The docs may also be run locally.
+
+Documentation search is powered by [Algolia's DocSearch](https://community.algolia.com/docsearch/). Working on our search? Be sure to set `debug: true` in `site/docs/4.5/assets/js/src/search.js` file.
+
+### Running documentation locally
+
+1. Run through the [tooling setup](https://getbootstrap.com/docs/4.5/getting-started/build-tools/#tooling-setup) to install Jekyll (the site builder) and other Ruby dependencies with `bundle install`.
+2. Run `npm install` to install Node.js dependencies.
+3. Run `npm start` to compile CSS and JavaScript files, generate our docs, and watch for changes.
+4. Open `http://localhost:9001` in your browser, and voilà.
+
+Learn more about using Jekyll by reading its [documentation](https://jekyllrb.com/docs/).
+
+### Documentation for previous releases
+
+You can find all our previous releases docs on <https://getbootstrap.com/docs/versions/>.
+
+[Previous releases](https://github.com/twbs/bootstrap/releases) and their documentation are also available for download.
+
+
+## Contributing
+
+Please read through our [contributing guidelines](https://github.com/twbs/bootstrap/blob/v4-dev/.github/CONTRIBUTING.md). Included are directions for opening issues, coding standards, and notes on development.
+
+Moreover, if your pull request contains JavaScript patches or features, you must include [relevant unit tests](https://github.com/twbs/bootstrap/tree/v4-dev/js/tests). All HTML and CSS should conform to the [Code Guide](https://github.com/mdo/code-guide), maintained by [Mark Otto](https://github.com/mdo).
+
+Editor preferences are available in the [editor config](https://github.com/twbs/bootstrap/blob/v4-dev/.editorconfig) for easy use in common text editors. Read more and download plugins at <https://editorconfig.org/>.
+
+
+## Community
+
+Get updates on Bootstrap's development and chat with the project maintainers and community members.
+
+- Follow [@getbootstrap on Twitter](https://twitter.com/getbootstrap).
+- Read and subscribe to [The Official Bootstrap Blog](https://blog.getbootstrap.com/).
+- Join [the official Slack room](https://bootstrap-slack.herokuapp.com/).
+- Chat with fellow Bootstrappers in IRC. On the `irc.freenode.net` server, in the `##bootstrap` channel.
+- Implementation help may be found at Stack Overflow (tagged [`bootstrap-4`](https://stackoverflow.com/questions/tagged/bootstrap-4)).
+- Developers should use the keyword `bootstrap` on packages which modify or add to the functionality of Bootstrap when distributing through [npm](https://www.npmjs.com/browse/keyword/bootstrap) or similar delivery mechanisms for maximum discoverability.
+
+
+## Versioning
+
+For transparency into our release cycle and in striving to maintain backward compatibility, Bootstrap is maintained under [the Semantic Versioning guidelines](https://semver.org/). Sometimes we screw up, but we adhere to those rules whenever possible.
+
+See [the Releases section of our GitHub project](https://github.com/twbs/bootstrap/releases) for changelogs for each release version of Bootstrap. Release announcement posts on [the official Bootstrap blog](https://blog.getbootstrap.com/) contain summaries of the most noteworthy changes made in each release.
+
+
+## Creators
+
+**Mark Otto**
+
+- <https://twitter.com/mdo>
+- <https://github.com/mdo>
+
+**Jacob Thornton**
+
+- <https://twitter.com/fat>
+- <https://github.com/fat>
+
+
+## Thanks
+
+<a href="https://www.browserstack.com/">
+  <img src="https://live.browserstack.com/images/opensource/browserstack-logo.svg" alt="BrowserStack Logo" width="192" height="42">
+</a>
+
+Thanks to [BrowserStack](https://www.browserstack.com/) for providing the infrastructure that allows us to test in real browsers!
+
+
+## Sponsors
+
+Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/bootstrap#sponsor)]
+
+[![](https://opencollective.com/bootstrap/sponsor/0/avatar.svg)](https://opencollective.com/bootstrap/sponsor/0/website)
+[![](https://opencollective.com/bootstrap/sponsor/1/avatar.svg)](https://opencollective.com/bootstrap/sponsor/1/website)
+[![](https://opencollective.com/bootstrap/sponsor/2/avatar.svg)](https://opencollective.com/bootstrap/sponsor/2/website)
+[![](https://opencollective.com/bootstrap/sponsor/3/avatar.svg)](https://opencollective.com/bootstrap/sponsor/3/website)
+[![](https://opencollective.com/bootstrap/sponsor/4/avatar.svg)](https://opencollective.com/bootstrap/sponsor/4/website)
+[![](https://opencollective.com/bootstrap/sponsor/5/avatar.svg)](https://opencollective.com/bootstrap/sponsor/5/website)
+[![](https://opencollective.com/bootstrap/sponsor/6/avatar.svg)](https://opencollective.com/bootstrap/sponsor/6/website)
+[![](https://opencollective.com/bootstrap/sponsor/7/avatar.svg)](https://opencollective.com/bootstrap/sponsor/7/website)
+[![](https://opencollective.com/bootstrap/sponsor/8/avatar.svg)](https://opencollective.com/bootstrap/sponsor/8/website)
+[![](https://opencollective.com/bootstrap/sponsor/9/avatar.svg)](https://opencollective.com/bootstrap/sponsor/9/website)
+
+
+## Backers
+
+Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/bootstrap#backer)]
+
+[![Backers](https://opencollective.com/bootstrap/backers.svg?width=890)](https://opencollective.com/bootstrap#backers)
+
+
+## Copyright and license
+
+Code and documentation copyright 2011-2020 the [Bootstrap Authors](https://github.com/twbs/bootstrap/graphs/contributors) and [Twitter, Inc.](https://twitter.com) Code released under the [MIT License](https://github.com/twbs/bootstrap/blob/main/LICENSE). Docs released under [Creative Commons](https://creativecommons.org/licenses/by/3.0/).