message: Prepare stub for 2.6.0 release notes
diff: +<INSERT>, <NAME>, <HERE>, <USING>, <GITHUB>, <HANDLE>
  +
  +This release contains contributions from many people at Google, as well as:
  +
  +# Thanks to our Contributors
  +
  +*<NOTES SHOULD BE GROUPED PER AREA>
  +*<IF A CHANGE CLOSES A GITHUB ISSUE, IT SHOULD BE DOCUMENTED HERE>
  +*<SIMILAR TO ABOVE SECTION, BUT FOR OTHER IMPORTANT CHANGES / BUG FIXES>
  +
  +# Bug Fixes and Other Changes
  +
  +*<IF RELEASE CONTAINS MULTIPLE FEATURES FROM SAME AREA, GROUP THEM TOGETHER>
  +*<INSERT MAJOR FEATURE HERE, USING MARKDOWN SYNTAX>
  +
  +# Major Features and Improvements
  +
  +*<KNOWN LACK OF SUPPORT ON SOME PLATFORM, SHOULD GO HERE>
  +*<ADDING/BUMPING DEPENDENCIES SHOULD GO HERE>
  +*<CAVEATS REGARDING THE RELEASE (BUT NOT BREAKING CHANGES).>
  +
  +# Known Caveats
  +
  +*<THIS SECTION SHOULD CONTAIN API, ABI AND BEHAVIORAL BREAKING CHANGES>
  +*<DOCUMENT BREAKING CHANGES HERE>
  +
  +# Breaking Changes
  +
  +<INSERT SMALL BLURB ABOUT RELEASE FOCUS AREA AND POTENTIAL TOOLCHAIN CHANGES>
  +# Release 2.6.0
  +
  # Release 2.5.0
  <INSERT SMALL BLURB ABOUT RELEASE FOCUS AREA AND POTENTIAL TOOLCHAIN CHANGES>
  