Updated travis.yml to run on PHP7
Updated travis.yml to run on PHP7

tibrus/yii2-app-advanced,dixonsatit/yii2-dixon-starter,vitezmiklos/test,githubjeka/yii2-app-advanced,jgege/MonApp,dmitry-kulikov/yii2-app-advanced,Somefive/Athena,AnTAVR/yii2-app-advanced-ru,AnTAVR/yii2-app-advanced-ru,urmaul/yii2-app-advanced-mongodb,erycamel/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,cophiel/YII2-Learning,githubjeka/yii2-app-advanced,yiisoft/yii2-app-advanced,dmitry-kulikov/yii2-app-advanced,subdee/myportugal,mobilejazz/yii2-mj-cms-example,cophiel/YII2-Learning,jgege/MonApp,Somefive/Athena,yiisoft/yii2-app-advanced,AnTAVR/yii2-app-advanced-ru,nikbas/yii2-app-advanced,nikbas/yii2-app-advanced,yiijan/yii2-app-advanced,dixonsatit/yii2-dixon-starter,erycamel/yii2-app-advanced,subdee/myportugal,yiijan/yii2-app-advanced