Merge pull request #18337 from twbs/v3-no-feats-for-you

Explain in docs that v3 is closed off to new features

CONTRIBUTING.md

@@ -116,7 +116,13 @@ When feasible, we aim to report such upstream bugs to the relevant browser vendo
 
 ## Feature requests
 
-Feature requests are welcome. But take a moment to find out whether your idea
+Feature requests are welcome, but please note that they **must target
+[Bootstrap v4](https://github.com/twbs/bootstrap/tree/v4-dev),** because
+Bootstrap v3 is now in maintenance mode and is closed off to new features.
+This is so that we can focus our efforts on Bootstrap v4, the future of the
+framework.
+
+Before opening a feature request, please take a moment to find out whether your idea
 fits with the scope and aims of the project. It's up to *you* to make a strong
 case to convince the project's developers of the merits of this feature. Please
 provide as much detail and context as possible.
@@ -133,6 +139,13 @@ implementing features, refactoring code, porting to a different language),
 otherwise you risk spending a lot of time working on something that the
 project's developers might not want to merge into the project.
 
+In particular, **pull requests that add new features to Bootstrap v3 will be
+rejected.** Bootstrap v3 is now in maintenance mode and is therefore closed
+off to new features, so that we can focus our efforts on Bootstrap v4, the
+future of the framework. Pull requests that add new features should target
+[Bootstrap v4 (the `v4-dev` git branch)](https://github.com/twbs/bootstrap/tree/v4-dev)
+instead, where they will be welcomed and duly considered.
+
 Please adhere to the [coding guidelines](#code-guidelines) used throughout the
 project (indentation, accurate comments, etc.) and any other requirements
 (such as test coverage).

README.md

@@ -71,6 +71,8 @@ We provide compiled CSS and JS (`bootstrap.*`), as well as compiled and minified
 
 Have a bug or a feature request? Please first read the [issue guidelines](https://github.com/twbs/bootstrap/blob/master/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).
 
+Note that **feature requests must target [Bootstrap v4](https://github.com/twbs/bootstrap/tree/v4-dev),** because Bootstrap v3 is now in maintenance mode and is closed off to new features. This is so that we can focus our efforts on Bootstrap v4.
+
 
 ## Documentation
 
@@ -99,6 +101,8 @@ Please read through our [contributing guidelines](https://github.com/twbs/bootst
 
 Moreover, if your pull request contains JavaScript patches or features, you must include [relevant unit tests](https://github.com/twbs/bootstrap/tree/master/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).
 
+**Bootstrap v3 is now closed off to new features.** It has gone into maintenance mode so that we can focus our efforts on [Bootstrap v4](https://github.com/twbs/bootstrap/tree/v4-dev), the future of the framework. Pull requests which add new features (rather than fix bugs) should target [Bootstrap v4 (the `v4-dev` git branch)](https://github.com/twbs/bootstrap/tree/v4-dev) instead.
+
 Editor preferences are available in the [editor config](https://github.com/twbs/bootstrap/blob/master/.editorconfig) for easy use in common text editors. Read more and download plugins at <http://editorconfig.org>.