Update links in changelog

Use links that that include the commits between a version and the version before it.

CHANGELOG.md

@@ -20,14 +20,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update footer style
 - Render header logo link url customisable
 
-## [v-egi-1.0.0](https://github.com/EGI-Foundation/simplesamlphp-module-themeegi/releases/tag/v-egi-1.0.0) - 2018-05-07
+## [v-egi-1.0.0](https://github.com/EGI-Foundation/simplesamlphp-module-themeegi/compare/v2.0.0...v-egi-1.0.0) - 2018-05-07
 
 ### Changed
-- Replace themevanilla -> themeegi 
+- Replace themevanilla -> themeegi
 - Use EGI identity (logos, translations)
 - Use custom EGI footer
 
-## [v2.0.0](https://github.com/EGI-Foundation/simplesamlphp-module-themeegi/releases/tag/v2.0.0) - 2018-04-17
+## [v2.0.0](https://github.com/EGI-Foundation/simplesamlphp-module-themeegi/commits/v2.0.0) - 2018-04-17
 
 ### Added
 Create a new theme for SimpleSAMLphp. The theme is a fork from [simplesamlphp-module-themevanilla](https://github.com/rciam/simplesamlphp-module-themevanilla).