chore: fix travis yarn caching
chore: fix travis yarn caching

mattlewis92/angular2-calendar,juanfc/angular-calendar,mattlewis92/angular2-calendar,SamindaK/angular-calendar,mattlewis92/angular-calendar,juanfc/angular-calendar,mattlewis92/angular-calendar,juanfc/angular-calendar,mattlewis92/angular-calendar,SamindaK/angular-calendar,mattlewis92/angular-calendar,juanfc/angular-calendar,SamindaK/angular-calendar,mattlewis92/angular2-calendar