Fix Ci

.gitlab-ci.yml

@@ -9,15 +9,16 @@ stages:
   - build
   - build_develop
 
-before_script:
-  - pip install tox==2.9.1
-
 pep8:
+  before_script:
+    - pip install tox==2.9.1
   stage: check_style
   script:
     - tox -v -e pep8
 
 docstyle:
+  before_script:
+    - pip install tox==2.9.1
   stage: check_style
   script:
     - tox -v -e docstyle