message: Prepare stub for 2.5 release notes.
diff: +# Release 2.5.0
  +
  +<INSERT SMALL BLURB ABOUT RELEASE FOCUS AREA AND POTENTIAL TOOLCHAIN CHANGES>
  +
  +## Breaking Changes
  +
  +* <DOCUMENT BREAKING CHANGES HERE>
  +* <THIS SECTION SHOULD CONTAIN API, ABI AND BEHAVIORAL BREAKING CHANGES>
  +
  +## Known Caveats
  +
  +* <CAVEATS REGARDING THE RELEASE (BUT NOT BREAKING CHANGES).>
  +* <ADDING/BUMPING DEPENDENCIES SHOULD GO HERE>
  +* <KNWON LACK OF SUPPORT ON SOME PLATFORM, SHOULD GO HERE>
  +
  +## Major Features and Improvements
  +
  +* <INSERT MAJOR FEATURE HERE, USING MARKDOWN SYNTAX>
  +* <IF RELEASE CONTAINS MULTIPLE FEATURES FROM SAME AREA, GROUP THEM TOGETHER>
  +
  +## Bug Fixes and Other Changes
  +
  +* <SIMILAR TO ABOVE SECTION, BUT FOR OTHER IMPORTANT CHANGES / BUG FIXES>
  +* <IF A CHANGE CLOSES A GITHUB ISSUE, IT SHOULD BE DOCUMENTED HERE>
  +* <NOTES SHOULD BE GROUPED PER AREA>
  +
  +## Thanks to our Contributors
  +
  +This release contains contributions from many people at Google, as well as:
  +
  +<INSERT>, <NAME>, <HERE>, <USING>, <GITHUB>, <HANDLE>
  +
  # Release 2.4.0
  <INSERT SMALL BLURB ABOUT RELEASE FOCUS AREA AND POTENTIAL TOOLCHAIN CHANGES>
  