Fix format error in log 400 code error (#385)

Author: MyMaloks

atlassian/rest_client.py

@@ -164,7 +164,7 @@ def request(self, method='GET', path='/', data=None, flags=None, params=None, he
         elif response.status_code == 204:
             log.debug('Received: {0}\n "No Content" response'.format(response.status_code))
         elif response.status_code == 400:
-            log.error('Received: {0}\n Bad request \n'.format(response.status_code, response_content))
+            log.error('Received: {0}\n Bad request \n {1}'.format(response.status_code, response_content))
         elif response.status_code == 401:
             log.error('Received: {0}\n "UNAUTHORIZED" response'.format(response.status_code))
         elif response.status_code == 404: