Merge pull request #6 from JoshMcRose/changelog-update-v3.1.0

Changelog update - `v3.1.0`

Author: JoshMcRose

CHANGELOG.md

@@ -77,7 +77,8 @@
 
 - Fixes menu selection colors outside of editor
 
-[Unreleased]: https://github.com/joshmcrose/intellij-olive-theme/compare/v3.0.0...HEAD
+[Unreleased]: https://github.com/joshmcrose/intellij-olive-theme/compare/v3.1.0...HEAD
+[3.1.0]: https://github.com/joshmcrose/intellij-olive-theme/compare/v3.0.0...v3.1.0
 [3.0.0]: https://github.com/joshmcrose/intellij-olive-theme/compare/v2.2.0...v3.0.0
 [2.2.0]: https://github.com/joshmcrose/intellij-olive-theme/compare/v2.1.0...v2.2.0
 [2.1.0]: https://github.com/joshmcrose/intellij-olive-theme/compare/v2.0.0...v2.1.0