add heading to body

Author: seanogdev

tests/events/pull_request_opened.json

@@ -2,7 +2,7 @@
   "action": "opened",
   "number": 1,
   "pull_request": {
-    "body": "This is the body of the PR. https://xxxx.teamwork.com/#/tasks/123 https://xxx.teamwork.com/#/tasks/456",
+    "body": "# Test heading \n This is the body of the PR. https://xxxx.teamwork.com/#/tasks/123 https://xxx.teamwork.com/#/tasks/456",
     "head": {
       "ref": "pr-branch",
       "repo": {