Drop supporting JDK 9
Fixes
@@ -8,9 +8,6 @@ matrix:
install: . ./install-jdk.sh -F 10 -L BCL
- env: JDK='OpenJDK 10'
install: . ./install-jdk.sh -F 10 -L GPL
-# 9
- - env: JDK='Oracle JDK 9'
- jdk: oraclejdk9
# 8
- env: JDK='Oracle JDK 8'
jdk: oraclejdk8
