Merge branch 'patch-1' into 'master'

Force pip install 18.0 in tox.ini

See merge request !982

tox.ini

@@ -6,6 +6,7 @@ skip_missing_interpreters = True
 [testenv]
 changedir={toxinidir}/website
 commands =
+    pipenv run pip install pip==18.0
     ; Copy the env list to make not conflict with the Django version
     ; specified below
     pipenv --bare install --dev --ignore-pipfile