Adds get_issue_events to PullRequest object (#1154)

* Adds `get_issue_events` to `PullRequest` object

* Add unit test for

* Fix PullRequest.get_issue_events unit test

Use actual event ids...

* Fix missing import on PullRequest.

I wish the unit tests would run in Python3...

* Add PulReqeust.testGetIssueEvents ReplayData

* Updating replay data to use developer's personal credentials.

github/PullRequest.py

@@ -56,6 +56,8 @@ import github.IssueComment
 import github.Commit
 import github.PullRequestReview
 
+import Consts
+
 
 class PullRequest(github.GithubObject.CompletableGithubObject):
     """
@@ -627,6 +629,19 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
             None
         )
 
+    def get_issue_events(self):
+        """
+        :calls: `GET /repos/:owner/:repo/issues/:issue_number/events <http://developer.github.com/v3/issues/events>`_
+        :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.IssueEvent.IssueEvent`
+        """
+        return github.PaginatedList.PaginatedList(
+            github.IssueEvent.IssueEvent,
+            self._requester,
+            self.issue_url + "/events",
+            None,
+            headers={'Accept': Consts.mediaTypeLockReasonPreview}
+        )
+
     def get_review(self, id):
         """
         :calls: `GET /repos/:owner/:repo/pulls/:number/reviews/:id <https://developer.github.com/v3/pulls/reviews>`_

tests/PullRequest.py

@@ -131,6 +131,9 @@ class PullRequest(Framework.TestCase):
         comment = self.pull.get_issue_comment(8387331)
         self.assertEqual(comment.body, "Issue comment created by PyGithub")
 
+    def testGetIssueEvents(self):
+        self.assertListKeyEqual(self.pull.get_issue_events(), lambda e: e.id, [16349963, 16350729, 16350730, 16350731, 28469043, 98136335])
+
     def testGetReviewComments(self):
         epoch = datetime.datetime(1970, 1, 1, 0, 0)
         comments = self.pull.get_review_comments(since=epoch)