Add ActivitiesClient to IGithubClient.

Octokit/GitHubClient.cs

@@ -80,6 +80,7 @@ namespace Octokit
             Connection = connection;
             var apiConnection = new ApiConnection(connection);
             Authorization = new AuthorizationsClient(apiConnection);
+            Event = new ActivitiesClient(apiConnection);
             Issue = new IssuesClient(apiConnection);
             Miscellaneous = new MiscellaneousClient(connection);
             Notification = new NotificationsClient(apiConnection);
@@ -126,6 +127,7 @@ namespace Octokit
         public IConnection Connection { get; private set; }
 
         public IAuthorizationsClient Authorization { get; private set; }
+        public IActivitiesClient Event { get; set; }
         public IIssuesClient Issue { get; private set; }
         public IMiscellaneousClient Miscellaneous { get; private set; }
         public IOrganizationsClient Organization { get; private set; }

Octokit/IGitHubClient.cs

@@ -7,6 +7,7 @@ namespace Octokit
         IConnection Connection { get; }
 
         IAuthorizationsClient Authorization { get; }
+        IActivitiesClient Event { get; }
         IIssuesClient Issue { get; }
         IMiscellaneousClient Miscellaneous { get; }
         IOrganizationsClient Organization { get; }