Travis: update .travis.yml

Author: ctrueden

.travis.yml

@@ -1,12 +1,11 @@
 language: java
 jdk: oraclejdk8
 branches:
-  only: master
+  only:
+  - master
+  - "/.*-[0-9]+\\..*/"
 install: true
 script: ".travis/build.sh"
-after_success: ".travis/notify.sh Travis-Success"
-after_failure: ".travis/notify.sh Travis-Failure"
-env:
-  global:
-  - secure: l5k7gyNsC7cS1QcqPcSzxQeueZmakAvYRDBevIGA61yDjL/cK4Pyy/7yNz4CHo+mgHaHul9uLIQuZvQdeAs4FqHi37brY1//emVI4BiUow+XDvge7DttDJ+JjBlGsZrxX0YKtnn/V83WO23RtGGQUZ8PBwpNWYB52stDpizhqqg=
-  - secure: Hs3V7J4BmasiXNWOBzFuxYcPeImFYo8Ze3UWqg85gRa1YxKNbnJLGPjQoIcUxXQU34Fa0qvvWcPUyEjne+nAbWtAVrq/xRSVj5Fnen+UmH3fjV1aR6Rsr56gkdqlaeIfcxaaeGTeguHQB1LSNCIvcF5s8f6J+37l65UUxGsL3+4=
+cache:
+  directories:
+  - "~/.m2/repository"