re-enable master for travis-ci
re-enable master for travis-ci

borellaster/java-apns,mukhanov/java-apns,l0s/java-apns,mukhanov/java-apns,noahxinhao/java-apns,flozano/java-apns,Catapush/java-apns,treejames/java-apns,noahxinhao/java-apns,talk-to/java-apns,t-watana/java-apns,borellaster/java-apns,Catapush/java-apns,l0s/java-apns,talk-to/java-apns,notnoop/java-apns,leancloud/java-apns,treejames/java-apns,bilalsas/java-apns,t-watana/java-apns,notnoop/java-apns