Add GHC Steering Committee's own GfRC to the Acknowledgements

Author: mpilgrem

guidelines-for-respectful-communication/index.html

@@ -126,6 +126,12 @@ <h2>Acknowledgements</h2>
           Contributor covenant
         </a>
       </li>
+      <li>
+        The GHC Steering Committee's
+        <a href="https://github.com/ghc-proposals/ghc-proposals/blob/master/GRC.rst">
+          Guidelines for Respectful Communication
+        </a>
+      </li>
     </ul>
 
     <h2>Our Standards of Public Behaviour</h2>