Latest Python 3 Compat Change Broke my output

[jusrob]

Change b55a4c8 broke dogwrap logging on our systems.

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib64/python2.7/threading.py", line 804, in __bootstrap_inner
self.run()
File "/usr/local/lib/python2.7/site-packages/datadog/dogshell/wrap.py", line 68, in run
print >> sys.stderr, self._fwd_out.encode('utf8')
AttributeError: 'file' object has no attribute 'encode'

[jusrob]

I would think that changing line 67 to if self._fwd_out.encoding is not None: would address it.

[zippolyte]

Hey @jusrob

I believe #379 should fix your issues.

Closing, feel free to reopen if that's not the case.