Ugly quote fix for travis.yml
Ugly quote fix for travis.yml

- inspiration from https://github.com/travis-ci/travis-ci/issues/8597#issuecomment-337240810
- https://stackoverflow.com/questions/47742913/travis-ci-how-to-use-repository-variables-in-travis-yml

JohnONolan/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,kevinansfield/Ghost,TryGhost/Ghost,bitjson/Ghost,TryGhost/Ghost,ErisDS/Ghost,e10/Ghost,e10/Ghost,bitjson/Ghost,kevinansfield/Ghost,kevinansfield/Ghost,janvt/Ghost,TryGhost/Ghost,Gargol/Ghost,Gargol/Ghost,janvt/Ghost,Kikobeats/Ghost,ErisDS/Ghost,ErisDS/Ghost,Kikobeats/Ghost,JohnONolan/Ghost