Fix changelog

Author: MaximeRVY

CHANGELOG.md

@@ -3,7 +3,7 @@
 #### Features
 
 * Your contribution here.
-* [#48](https://github.com/ruby-grape/grape-swagger-entity/pull/48): Add support for extensions - [@MaximeRDY]
+* [#48](https://github.com/ruby-grape/grape-swagger-entity/pull/48): Add support for extensions - [@MaximeRDY](https://github.com/MaximeRDY).
 
 #### Fixes