Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -23,6 +23,7 @@ test_style:
 test_function:
     stage: test
     image: continuumio/miniconda3:latest
+    before_script: []
     script:
         # Execute all tests and also check coverage with --cov:
         - python setup.py test --addopts "--cov"