build(jdk): Use openjdk not oracle jdk for Travis build
build(jdk): Use openjdk not oracle jdk for Travis build

Oracle JDK is EOL and no longer available

Co-Authored-By: Andrew Byrd <d49247e2ca0dfb000d7ffce1a3c78b78f7313e3f@conveyal.com>

conveyal/r5,conveyal/r5,conveyal/r5,conveyal/r5,conveyal/r5