Fix links in changelog.

Author: jhedstrom

CHANGELOG.md

@@ -12,5 +12,5 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   * [#7](https://github.com/drupal-composer/info-rewrite/pull/7): Fatal error when no `.info` files exist.
   * [#10](https://github.com/drupal-composer/info-rewrite/pull/10): Drupal core had 4-digit version string.
 
-[Unreleased]: https://github.com/drupal-composer/info-rewrite/compare/v1.0.0beta1...HEAD
-[1.0.0 beta1]: https://github.com/drupal-composer/info-rewrite/compare/v1.0.0alpha1...v1.0.0beta1
+[Unreleased]: https://github.com/drupal-composer/info-rewrite/compare/1.0.0-beta1...HEAD
+[1.0.0 beta1]: https://github.com/drupal-composer/info-rewrite/compare/1.0.0-alpha1...1.0.0-beta1