fix(travis): fix bad install: syntax

Author: jelbourn

.travis.yml

@@ -8,8 +8,8 @@ addons:
   firefox: "latest"
 
 install:
-  npm install -g angular-cli
-  npm install
+  - npm install -g angular-cli
+  - npm install
 
 before_script:
   # Necessary to run test on Travis CI that require a graphical interface.