8251551: Use .md filename extension for README

[gdams]

backports https://bugs.openjdk.org/browse/JDK-8251551 as it's a low risk change

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8251551: Use .md filename extension for README

Reviewers

• Paul Hohensee (@phohensee - Reviewer)
• Christoph Langer (@RealCLanger - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev pull/1161/head:pull/1161
$ git checkout pull/1161

Update a local copy of the PR:
$ git checkout pull/1161
$ git pull https://git.openjdk.org/jdk11u-dev pull/1161/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1161

View PR using the GUI difftool:
$ git pr show -t 1161

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/1161.diff

[bridgekeeper]

👋 Welcome back gdams! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (b618bb2f)

[phohensee]

Looks clean. Lgtm.

[openjdk]

@gdams This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8251551: Use .md filename extension for README

Reviewed-by: phh, clanger

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• 246f48e: 8212904: JTextArea line wrapping incorrect when using UI scale

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@phohensee, @RealCLanger) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[gdams]

/integrate

[openjdk]

@gdams
Your change (at version b618bb2) is now ready to be sponsored by a Committer.

[phohensee]

You now have to ask for integration permission by tagging the JBS issue with the "jdk11u-fix-request" label and a "Fix Request (11u)" comment. I'll sponsor.

[RealCLanger]

I've flagged approval, change looks correct.

/sponsor

[openjdk]

Going to push as commit 4fbe635.
Since your change was applied there has been 1 commit pushed to the master branch:

• 246f48e: 8212904: JTextArea line wrapping incorrect when using UI scale

Your commit was automatically rebased without conflicts.

[openjdk]

@RealCLanger @gdams Pushed as commit 4fbe635.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.