add missing observable client

Octokit.Reactive/Clients/IObservableRepositoriesClient.cs

@@ -597,12 +597,21 @@ public interface IObservableRepositoriesClient
         /// See the <a href="https://developer.github.com/v3/repos/keys/">Repository Deploy Keys API documentation</a> for more information.
         /// </remarks>
         IObservableRepositoryDeployKeysClient DeployKeys { get; }
+
         /// <summary>
         /// A client for GitHub's Repository Pages API.
         /// </summary>
         /// <remarks>
         /// See the <a href="https://developer.github.com/v3/repos/pages/">Repository Pages API documentation</a> for more information.
         /// </remarks>
         IObservableRepositoryPagesClient Page { get; }
+
+        /// <summary>
+        /// A client for GitHub's Repository Invitations API.
+        /// </summary>
+        /// <remarks>
+        /// See the <a href="https://developer.github.com/v3/repos/invitations/">Repository Invitations API documentation</a> for more information.
+        /// </remarks>
+        IObservableRepositoryInvitationsClient Invitation { get; }
     }
 }

Octokit.Reactive/Clients/ObservableRepositoriesClient.cs

@@ -42,6 +42,7 @@ public ObservableRepositoriesClient(IGitHubClient client)
             Content = new ObservableRepositoryContentsClient(client);
             Merging = new ObservableMergingClient(client);
             Page = new ObservableRepositoryPagesClient(client);
+            Invitation = new ObservableRepositoryInvitationsClient(client);
         }
 
         /// <summary>
@@ -900,5 +901,13 @@ public IObservable<CompareResult> Compare(string owner, string name, string @bas
         /// See the <a href="https://developer.github.com/v3/repos/pages/">Repository Pages API documentation</a> for more information.
         /// </remarks>
         public IObservableRepositoryPagesClient Page { get; private set; }
+
+        /// <summary>
+        /// A client for GitHub's Repository Invitations API.
+        /// </summary>
+        /// <remarks>
+        /// See the <a href="https://developer.github.com/v3/repos/invitations/">Repository Invitations API documentation</a> for more information.
+        /// </remarks>
+        public IObservableRepositoryInvitationsClient Invitation { get; private set; }        
     }
 }

Octokit/Models/Request/InvitationUpdate.cs

@@ -5,12 +5,9 @@
 namespace Octokit
 {
     /// <summary>
-    /// Used to update a gist and its contents.
+    /// Used to update a invitation.
     /// </summary>
-    /// <remarks>
-    /// Note: All files from the previous version of the gist are carried over by default if not included in the
-    ///  object. Deletes can be performed by including the filename with a null object.
-    /// API docs: https://developer.github.com/v3/gists/
+    /// <remarks>    
     /// </remarks>
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class InvitationUpdate