Update CONTRIBUTING.md

Author: Noor Dawod

CONTRIBUTING.md

@@ -5,7 +5,7 @@ AsyncHttpClient is an open-source project made by developers for developers!
 If you would like to contribute to the project, it's really great. You can contribute in a variety of ways:
 
   * Help us with test cases and examples for the Wiki  
-  * If you have a good idea/patch for the project, create a [pull request](#pull-request)
+  * If you have a good idea/patch for the project, create a [pull request](#pull-requests)
   * Found a bug? You're more than welcome to [submit an issue](issues)
   * Help other fellow developers solve their problems, you're welcome to do so in issues