Update CHANGELOG.md

Cleaned up compare links and added links for issue numbers.

Author: marcins

CHANGELOG.md

@@ -4,28 +4,29 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [3.1.0] - 2017 - 08 - 31
+## [3.1.0] - 2017-08-31
 ### Added
 - provide a Browserified distribution in the `dist` directory of the published npm module
 
 ## [3.0.0] - 2017-08-03
 ### Changed
-- remove dependency on ImmutableJs (#30)
+- remove dependency on ImmutableJs ([#30](https://github.com/mattkrick/redux-optimistic-ui/issues/30))
 
 ### Fixes
-- fix interoperability with Redux DevTools (#36)
+- fix interoperability with Redux DevTools ([#36](https://github.com/mattkrick/redux-optimistic-ui/issues/36))
 
 ## [2.1.0] - 2017-07-28
 ### Fixes
-- correctly handle invalid transaction ids (#32)
+- correctly handle invalid transaction ids ([#32](https://github.com/mattkrick/redux-optimistic-ui/issues/32))
 
 ## [2.0.0] - 2017-06-23
 ### Fixes
-- fix error with non-root optimistic reducer and `initialState` (#22)
+- fix error with non-root optimistic reducer and `initialState` ([#22](https://github.com/mattkrick/redux-optimistic-ui/issues/22))
 
 ## 1.0.0 - 2017-02-17
 
-[Unreleased]: https://github.com/mattkrick/redux-optimistic-ui/compare/v3.0.0...HEAD
-[3.0.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v2.1.0...HEAD
-[2.1.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v2.0.0...HEAD
-[2.0.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v1.0.0...HEAD
+[Unreleased]: https://github.com/mattkrick/redux-optimistic-ui/compare/v3.1.0...HEAD
+[3.1.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v3.0.0...v3.1.0
+[3.0.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v2.1.0...v3.0.0
+[2.1.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v2.0.0...v2.1.0
+[2.0.0]: https://github.com/mattkrick/redux-optimistic-ui/compare/v1.0.0...v2.0.0