Update databases/py-memcached to version 1.53
Update devel/glibmm-reference to version 2.34.1_1,1
Update devel/dulwich to version 0.9.0
Update devel/py-greenlet to version 0.4.1
Tweak www/py-WebTest version 2.0.3
Update converters/py-unidecode to version 0.04.13
Update devel/py-pytest-runner to version 2.0
Tweak devel/epydoc version 3.0.1