A bug in tweepy streaming API

I found a bug in tweepy streaming API .
It can't filter by tag with non Latin characters.
I was astonished coz this was working when I used it some months ago (version 1.3 if I remember well).
So here is my small contribution to the project :
def filter(self, follow=None, track=None, async=False):
   params = {}
   self.headers['Content-type'] = "application/x-www-form-urlencoded"
should be :
def filter(self, follow=None, track=None, async=False):
   params = {}
   self.headers['Content-type'] = "application/x-www-form-urlencoded; charset=utf-8"
I have only tested streaming and only tag filtering - probably this applies to other parts but I am not sure.