Re-enable Travis builds

.travis.yml

@@ -17,7 +17,7 @@ before_install:
 install:
   - sudo apt-get -qq update
   - sudo apt-get -qq install libssl-dev pkg-config libhunspell-dev libxcb-util0-dev
-  - if [[ "$QT" == "qt56" ]]; then sudo apt-add-repository -y ppa:beineri/opt-qt56-beta-trusty; sudo apt-get update -qq; sudo apt-get install -qq qt56tools qt56script qt56webengine qt56webchannel qt56declarative qt56x11extras; fi
+  - if [[ "$QT" == "qt56" ]]; then sudo apt-add-repository -y ppa:beineri/opt-qt56-trusty; sudo apt-get update -qq; sudo apt-get install -qq qt56tools qt56script qt56webengine qt56webchannel qt56declarative qt56x11extras; fi
 
 script:
   - QMAKE="qmake"