Corrected .travis.yml

Author: darekplawecki

.travis.yml

@@ -7,7 +7,7 @@ before_install:
   # starting a GUI to run tests, per https://docs.travis-ci.com/user/gui-and-headless-browsers/#Using-xvfb-to-Run-Tests-That-Require-a-GUI
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
-install:
+before_script:
   - npm install -g @angular/cli
 script:
   - npm run-script build4prod