possible build fix with java 10

Author: doom369

.travis.yml

@@ -1,12 +1,7 @@
 language: java
 
-before_install:
-  - wget https://github.com/sormuras/bach/raw/master/install-jdk.sh
-
-matrix:
-  include:
-      - env: JDK='OpenJDK 10'
-        install: . ./install-jdk.sh -F 10 -L GPL
+jdk:
+  - oraclejdk10
 
 addons:
   postgresql: "9.5"