Force trusty distribution on Travis CI to keep access to Oracle's JDK8
Force trusty distribution on Travis CI to keep access to Oracle's JDK8

Oracle's JDK is required because openjdk doesn't have JavaFX:
https://github.com/AdoptOpenJDK/openjdk-build/issues/577

Here is the Travis-related post explaining how to use Oracle JDK8:
https://travis-ci.community/t/install-of-oracle-jdk8-is-failing/4365/2

joffrey-bion/fx-gson,joffrey-bion/fx-gson