Update requirements_base.txt

pointing to djangocms 4.0.x branch

tests/requirements/requirements_base.txt

@@ -2,7 +2,6 @@ coverage
 django-app-helper
 django-filer==2.2.3
 djangocms-audio
-djangocms-versioning==1.2.2
 djangocms-video
 factory-boy
 flake8
@@ -12,4 +11,5 @@ mock
 
 # Unreleased django-cms 4.0 compatible packages
 https://github.com/django-cms/django-cms/tarball/release/4.0.1.x#egg=django-cms
+https://github.com/django-cms/djangocms-versioning/tarball/support/django-cms-4.0.x#egg=djangocms-versioning
 https://github.com/Aiky30/djangocms-moderation/tarball/master#egg=djangocms-moderation