added new url for reactions

Octokit/Helpers/ApiUrls.cs

@@ -424,6 +424,17 @@ namespace Octokit
             return "repos/{0}/{1}/comments/{2}/reactions".FormatUri(owner, name, number);
         }
 
+        /// <summary>
+        /// Returns the <see cref="Uri"/> for the reaction of a specified commit comment.
+        /// </summary>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="number">The comment number</param>
+        /// <returns></returns>
+        public static Uri CommitCommentReactions(int repositoryId, int number)
+        {
+            return "repositories/{0}/comments/{2}/reactions".FormatUri(repositoryId, number);
+        }
+
         /// <summary>
         /// Returns the <see cref="Uri"/> that returns all of the assignees to which issues may be assigned.
         /// </summary>