travis: switch jdk8
travis: switch jdk8

Primokorn/Cornowser,xdevs23/Cornowser,xdevs23/Cornowser,Primokorn/Cornowser,xdevs23/Cornowser,xdevs23/Cornowser,AppsByDavideV/Cornowser,AppsByDavideV/Cornowser,AppsByDavideV/Cornowser,Primokorn/Cornowser,Primokorn/Cornowser,AppsByDavideV/Cornowser