Fix style issue

Author: rubengees

library/src/main/java/me/proxer/library/api/info/ForumDiscussionsEndpoint.java

@@ -13,7 +13,7 @@
  * @author Ruben Gees
  */
 @Accessors(fluent = true)
-public class ForumDiscussionsEndpoint implements Endpoint<List<ForumDiscussion>> {
+public final class ForumDiscussionsEndpoint implements Endpoint<List<ForumDiscussion>> {
 
     private final InternalApi internalApi;