Update changelog for 3.1.0 release

Author: acrobat

CHANGELOG-3.X.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## 3.1.0
+
+### Added
+- Add workflow dispatch and allow workflow names. ([fodinabor](https://github.com/fodinabor)) [#969](https://github.com/KnpLabs/php-github-api/issues/969)
+
+### Changed
+- Re-enable roave bc check for 3.x ([acrobat](https://github.com/acrobat)) [#958](https://github.com/KnpLabs/php-github-api/issues/958)
+- Cleanup 3.0.0 changelog ([acrobat](https://github.com/acrobat)) [#957](https://github.com/KnpLabs/php-github-api/issues/957)
+- Update new GitHub doc links in repo. ([fodinabor](https://github.com/fodinabor)) [#974](https://github.com/KnpLabs/php-github-api/issues/974)
+
+### Fixed
+- Add accept header for the checks API ([Agares](https://github.com/Agares)) [#968](https://github.com/KnpLabs/php-github-api/issues/968)
+- ExceptionThrower: adjust rate limit detection ([glaubinix](https://github.com/glaubinix)) [#959](https://github.com/KnpLabs/php-github-api/issues/959)
+
 ## 3.0.0
 
 ### Added