Use JDKs provided by travis

.travis.yml

@@ -14,25 +14,13 @@
 # limitations under the License.
 
 language: java
-sudo: false
 
-# Get latest install-jdk.sh script
-before_install:
-  - wget -P ./target/ https://github.com/sormuras/bach/raw/master/install-jdk.sh
-
-matrix:
-  include:
-    - env: JDK_RELEASE='OracleJDK 8'
-      jdk: oraclejdk8
-    - env: JDK_RELEASE='OracleJDK 9'
-      jdk: oraclejdk9
-    - env: JDK_RELEASE='OracleJDK 10'
-      jdk: oraclejdk10
-    - env: JDK_RELEASE='OpenJDK 10'
-      jdk: openjdk10
-# Java 11 "Oracle JDK" (not yet provided by Travis CI)
-    - env: JDK='Oracle JDK 11'
-      install: . ./target/install-jdk.sh -F 11 -L BCL
+jdk:
+  - oraclejdk8
+  - oraclejdk9
+  - oraclejdk10
+  - openjdk10
+  - openjdk11
 
 script:
   - mvn