Fix eslint dependency

.gitlab-ci.yml

@@ -26,10 +26,15 @@ test:
     script:
         - python manage.py test
 
-lint:
+pep8:
     stage: lint
-    variables:
-        DATABASE_URL: "postgresql://postgres:postgres@postgres:5432/$POSTGRES_DB"
     script:
-        - pep8 --count && eslint .
+        - pep8 --count
+
+eslint:
+    image: node:7.10.0
+    stage: lint
+    script:
+        - npm install -g eslint
+        - eslint .