FullStats failts on python 3

[gbarba]

circus 0.12.1 (from pip)
python 3.4.3

Running at local and at Heroku:

2015-12-18 17:05:25 tornado.application[30] [ERROR] Exception in callback <bound method FullStats.look_after of <circus.plugins.statsd.FullStats object at 0x7f5abcf5cf60>>
Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.4/site-packages/tornado/ioloop.py", line 1039, in _run
return self.callback()
File "/app/.heroku/python/lib/python3.4/site-packages/circus/plugins/statsd.py", line 128, in look_after
self.statsd.gauge("_stats.%s.watchers_num" % name, len(cpus))
File "/app/.heroku/python/lib/python3.4/site-packages/circus/plugins/statsd.py", line 37, in gauge
self.send(bucket, "%s|g" % value)
File "/app/.heroku/python/lib/python3.4/site-packages/circus/plugins/statsd.py", line 26, in send
self.socket.sendto("%s:%s" % (bucket, value), (self.host, self.port))
TypeError: 'str' does not support the buffer interface