message: DOC: fix links in release notes
diff: @@ -231,8 +231,8 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
  ### Known Bugs
  -
  -
  -[Unreleased]: https://github.com/LLNL/axom/compare/v0.3.0...develop
  +[Unreleased]: https://github.com/LLNL/axom/compare/v0.3.1...develop
  +[Version 0.3.1]: https://github.com/LLNL/axom/compare/v0.3.0...v0.3.1
  [Version 0.3.0]: https://github.com/LLNL/axom/compare/v0.2.9...v0.3.0
  [Version 0.2.9]: https://github.com/LLNL/axom/compare/v0.2.8...v0.2.9
  