The implicit namespace package test from 4b276bae87 can only be used for Python 3.4+

tox.ini

@@ -9,8 +9,8 @@ deps =
 # coloroma for colored debug output
     colorama
 # Overwrite the parso version (only used sometimes).
-    git+https://github.com/davidhalter/parso.git
-#    -rrequirements.txt
+#    git+https://github.com/davidhalter/parso.git
+    -rrequirements.txt
 passenv = JEDI_TEST_ENVIRONMENT
 setenv =
 # https://github.com/tomchristie/django-rest-framework/issues/1957