Apply Python 3 futurize transform lib2to3.fixes.fix_idioms

Refer to #256

api/integrations/basecamp/zulip_basecamp_mirror

@@ -122,7 +122,7 @@ def run_mirror():
     try:
         # we use an exponential backoff approach when we get 429 (Too Many Requests).
         sleepInterval = 1
-        while 1:
+        while True:
             time.sleep(sleepInterval)
             response = requests.get("https://basecamp.com/%s/api/v1/events.json" % (config.BASECAMP_ACCOUNT_ID),
                                     params={'since': since},

api/integrations/codebase/zulip_codebase_mirror

@@ -277,7 +277,7 @@ def run_mirror():
 
     try:
         sleepInterval = 1
-        while 1:
+        while True:
             events = make_api_call("activity")[::-1]
             if events is not None:
                 sleepInterval = 1