Use Node:11 in CI

.gitlab-ci.yml

@@ -17,7 +17,7 @@ stages:
 
 review_front:
   stage: review
-  image: node:9
+  image: node:11
   when: manual
   allow_failure: true
   before_script:
@@ -159,7 +159,7 @@ test_api:
 
 test_front:
   stage: test
-  image: node:9
+  image: node:11
   before_script:
     - cd front
   only:
@@ -181,7 +181,7 @@ test_front:
 
 build_front:
   stage: build
-  image: node:9
+  image: node:11
   before_script:
     - curl -L -o /usr/local/bin/jq https://github.com/stedolan/jq/releases/download/jq-1.5/jq-linux64
     - chmod +x /usr/local/bin/jq