Merge pull request #5077 from barryvdh/patch-2

Add compare link to changelog for beta1

CHANGELOG.md

@@ -298,6 +298,7 @@
 
   * Initial release
 
+[1.0.0-beta1]: https://github.com/composer/composer/compare/1.0.0-alpha11...1.0.0-beta1
 [1.0.0-alpha11]: https://github.com/composer/composer/compare/1.0.0-alpha10...1.0.0-alpha11
 [1.0.0-alpha10]: https://github.com/composer/composer/compare/1.0.0-alpha9...1.0.0-alpha10
 [1.0.0-alpha9]: https://github.com/composer/composer/compare/1.0.0-alpha8...1.0.0-alpha9