Reduce fallback notification theshold to 25%

Dropping the threshold and adding Colin as requested on...

  https://trac.torproject.org/projects/tor/ticket/29094

fallback_directories.py

@@ -16,8 +16,8 @@ import util
 
 log = util.get_logger('fallback_directories')
 
-NOTIFICATION_THRESHOLD = 50  # send notice if this percentage of fallbacks are unusable
-TO_ADDRESSES = ['tor-consensus-health@lists.torproject.org', 'teor@torproject.org', 'nickm@torproject.org']
+NOTIFICATION_THRESHOLD = 25  # send notice if this percentage of fallbacks are unusable
+TO_ADDRESSES = ['tor-consensus-health@lists.torproject.org', 'teor@torproject.org', 'nickm@torproject.org', 'colin@torproject.org']
 EMAIL_SUBJECT = 'Fallback Directory Summary (%i/%i, %i%%)'
 
 EMAIL_BODY = """\