Update .gitlab-ci.yml

1 job for master in 1 minute and 11 seconds
Status Job ID Name Coverage
failed #115841463


Name Stage Failure
pages Deploy
npm ERR! phantomjs-prebuilt@2.1.16 install: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the phantomjs-prebuilt@2.1.16 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2018-11-02T15_14_01_154Z-debug.log
ERROR: Job failed: exit code 1