SyntaxError with python 3.6 and above

Great catch from Juan...

BUILDSTDERR:   File "/usr/lib/python3.7/site-packages/stem/util/test_tools.py", line 151
BUILDSTDERR:     self.method.async = self
BUILDSTDERR:                     ^
BUILDSTDERR: SyntaxError: invalid syntax

Took a little head scratching but think I know what's going on. Python 3.6 added a couple new keywords including 'async' and 'await'. This in turn breaks the above since we were using that name.

https://docs.python.org/3/whatsnew/3.6.html#whatsnew36-pep530 https://www.python.org/dev/peps/pep-0530/

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