Unbreak Travis build.

Also add JDK 11 to build matrix as an allowed_failure, and fix broken EA JDK (though it's still failing).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=217797424
diff --git a/.travis.yml b/.travis.yml
index cadaeeb..2911d0d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,12 +10,14 @@
 jdk:
   - oraclejdk8
   - oraclejdk9
-  - oraclejdk10
-  - oraclejdk-ea
+  - openjdk10
+  - openjdk11
+  - openjdk-ea
 
 matrix:
   allow_failures:
-    - jdk: oraclejdk-ea
+    - jdk: openjdk11
+    - jdk: openjdk-ea
 
 # see https://github.com/travis-ci/travis-ci/issues/8408
 before_install: