Update bugbug from 0.0.56 to 0.0.61 (#758)

requirements.txt

@@ -9,7 +9,7 @@ requests>=2.20.0
 python-Levenshtein>=0.12.0
 pytz>=2018.9
 whatthepatch>=0.0.5
-bugbug==0.0.56
+bugbug==0.0.61
 icalevents==0.1.20
 icalendar==4.0.3
 sqlalchemy==1.3.5