Adds method for listing review comments

lib/Repository.js

@@ -803,6 +803,17 @@ class Repository extends Requestable {
    mergePullRequest(number, options, cb) {
       return this._request('PUT', `/repos/${this.__fullname}/pulls/${number}/merge`, options, cb);
    }
+
+   /**
+    * List review comments on an pull request
+    * @see https://developer.github.com/v3/pulls/comments/#list-comments-on-a-pull-request
+    * @param {number|string} number - the number of the pull request to get review comments from
+    * @param {Requestable.callback} [cb] - will receive the comments
+    * @return {Promise} - the promise for the http request
+    */
+    listPullRequestReviewComments(number, cb) {
+      return this._request('GET', `/repos/${this.__fullname}/pulls/${number}/comments`, null, cb);
+    }
 }
 
 module.exports = Repository;

test/repository.spec.js

@@ -240,6 +240,16 @@ describe('Repository', function() {
             done();
          }));
       });
+
+      it('should list review comments', function(done) {
+        const repo = github.getRepo('michael', 'github');
+
+        repo.listPullRequestReviewComments(401, assertSuccessful(done, function(err, reviewComments) {
+          expect(reviewComments).to.be.an.array();
+          //expect(reviewComments[0]).to.have.own('body', 'Comment test'); //TODO: Need to establish a test PR with test review comments
+          done();
+        }));
+      });
    });
 
    describe('creating/modifiying', function() {