Update CONTRIBUTING.md

Author: thinkingserious

CONTRIBUTING.md

@@ -100,7 +100,7 @@ An HTTP client with a fluent interface using method chaining and reflection. By
 
 This allows for the following mapping from a URL to a method chain:
 
-`/api_client/{api_key_id}/version` maps to `client.api_client._(api_key_id).version.<method>()` where <method> is a [https://github.com/sendgrid/csharp-http-client/blob/master/CSharpHTTPClient/Client.cs#L71).
+`/api_client/{api_key_id}/version` maps to `client.api_client._(api_key_id).version.<method>()` where <method> is a supported [Method](https://github.com/sendgrid/csharp-http-client/blob/master/CSharpHTTPClient/Client.cs#L71).
 
 <a name="testing"></a>
 ## Testing