removed jdk 9 and 10

.travis.yml

@@ -6,9 +6,7 @@ scala:
 - 2.12.6
 jdk:
 - oraclejdk8
-- oraclejdk9
-- oraclejdk10
-- oraclejdk11
+- openjdk11
 env:
   matrix:
     - SCRIPT=scripts/test-sbt
@@ -29,19 +27,15 @@ before_cache:
 matrix:
   exclude:
     - scala: 2.11.12
-      jdk: oraclejdk9
-    - scala: 2.11.12
-      jdk: oraclejdk10
-    - scala: 2.11.12
-      jdk: oraclejdk11
+      jdk: openjdk11
   allow_failures:
     # We should allow failures here since Java 11 removed some modules including
     # java.xml.bind which we are adding when running with Java 9+. For more details
     # see http://openjdk.java.net/jeps/320
     #
     # Play already has a fix for that, but it needs to be backported and released
     # for 2.6.x: https://github.com/playframework/playframework/pull/8382
-    - jdk: oraclejdk11
+    - jdk: openjdk11
 
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