Merge pull request #266 from SethTisue/openjdk11-fixup

complete OracleJDK11 -> OpenJDK11 move

Author: ashawley

Diff for: .travis.yml

@@ -34,16 +34,16 @@ env:
 
 matrix:
   exclude:
-    - jdk: oraclejdk11
+    - jdk: openjdk11
       env: SCALAJS_VERSION=0.6.25
-    - jdk: oraclejdk11
+    - jdk: openjdk11
       env: SCALAJS_VERSION=1.0.0-M5
     - scala: 2.11.12
       env: SCALAJS_VERSION=1.0.0-M5
     - scala: 2.11.12
       jdk: oraclejdk8
     - scala: 2.11.12
-      jdk: oraclejdk11
+      jdk: openjdk11
     - scala: 2.12.6
       jdk: openjdk6
     - scala: 2.13.0-M3