fix(repository): Added updatePullRequest method

This change deprecates the updatePullRequst method

fixes #362
closes #365

Author: AurelioDeRosa

lib/Repository.js

@@ -485,13 +485,28 @@ class Repository extends Requestable {
 
    /**
     * Update a pull request
+    * @deprecated since version 2.4.0
     * @see https://developer.github.com/v3/pulls/#update-a-pull-request
     * @param {number|string} number - the number of the pull request to update
     * @param {Object} options - the pull request description
     * @param {Requestable.callback} [cb] - will receive the pull request information
     * @return {Promise} - the promise for the http request
     */
    updatePullRequst(number, options, cb) {
+      log('Deprecated: This method contains a typo and it has been deprecated. It will be removed in next major version. Use updatePullRequest() instead.');
+
+      return this.updatePullRequest(number, options, cb);
+   }
+
+   /**
+    * Update a pull request
+    * @see https://developer.github.com/v3/pulls/#update-a-pull-request
+    * @param {number|string} number - the number of the pull request to update
+    * @param {Object} options - the pull request description
+    * @param {Requestable.callback} [cb] - will receive the pull request information
+    * @return {Promise} - the promise for the http request
+    */
+   updatePullRequest(number, options, cb) {
       return this._request('PATCH', `/repos/${this.__fullname}/pulls/${number}`, options, cb);
    }