[Rev 01] RFR: 292: Add comment to PR when it becomes outdated

[Robin Westberg]

> Hi all,
> 
> Please review this change that posts an instructional message on how to sync with the target branch the first time a PR
> is marked as outdated.
> Best regards,
> Robin

Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:

  Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java
  
  Co-Authored-By: Erik Duveblad <erik.helin at oracle.com>

-------------

Changes:
  - all: https://git.openjdk.java.net/skara/pull/513/files
  - new: https://git.openjdk.java.net/skara/pull/513/files/0a148746..ed16b404

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/513/webrev.01
 - incr: https://webrevs.openjdk.java.net/skara/513/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/513.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/513/head:pull/513

PR: https://git.openjdk.java.net/skara/pull/513