Added a version requirement to python-memcached in test requirements.

tests/requirements/py2.txt

+2 −1

Original line number	Diff line number	Diff line
		-r base.txt
		python-memcached
		# Due to https://github.com/linsomniac/python-memcached/issues/79 in newer versions.
		python-memcached <= 1.53
		mock