Fix malformed version on aniso8601 requirement

Author: AdrianLC

setup.py

@@ -87,7 +87,7 @@ def run_tests(self):
         "six>=1.10.0,<2",
         "graphql-core>=2.1,<3",
         "graphql-relay>=0.4.5,<1",
-        "aniso8601>=3,<=6.0.*",
+        "aniso8601>=3,<=6.0",
     ],
     tests_require=tests_require,
     extras_require={