Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -3,11 +3,11 @@ cache:
   path:
     - venv/
 before-script:
-  - python --version
+  - python3 --version
   - virtualenv -q venv
-  - venv/bin/pip install --upgrade pip
+  - venv/bin/pip3 install --upgrade pip
   - source venv/bin/activate
-  - pip install requirements.txt
+  - pip3 install requirements.txt
 stages:
   - Static Analysis
 flake8: