Upgraded version of sonarqube-gradle-plugin dependency to 2.7. (#744)
Upgraded version of sonarqube-gradle-plugin dependency to 2.7. (#744)

fixes TweetWallFX/TweetwallFX#742
svenreimers/TweetwallFX,jmichelberger/TweetwallFX,mklaehn/TweetwallFX,TweetWallFX/TweetwallFX,fvogler/TweetwallFX,reinhapa/TweetwallFX