build: add package-lock.json

Author: felixfbecker

.gitignore

@@ -2,4 +2,3 @@ node_modules/
 out/
 vendor/
 .DS_Store
-package-lock.json

.npmrc

@@ -13,7 +13,7 @@ before_install:
   - nvm use 8
 
 install:
-  - npm install
+  - npm ci
 
 script:
   - npm run lint
@@ -25,7 +25,7 @@ jobs:
     - stage: release
       php: '7.1'
       install:
-        - npm install
+        - npm ci
         - composer install --prefer-dist --no-interaction --optimize-autoloader
       script:
         - npm run build