remove global attribute from angular-cli install

Author: electron2302

.drone.yml

@@ -20,12 +20,12 @@ steps:
   failure: ignore # only until PhantomJS is working, after that, this line should be deleted ! 
   commands:
   - cd brainkeeper
-  - "npm install -g @angular/cli"
+  - "npm install @angular/cli"
   - "ng test --browsers PhantomJS"
 
 - name: "Lint"
   image: node:10
   commands:
   - cd brainkeeper
-  - "npm install -g @angular/cli"
+  - "npm install @angular/cli"
   - ng lint