Drop openjdk12 and openjdk13 since these are neither LTS or the latest.

garydgregory · garydgregory · commit 9b8187cb42c5 · 2020-08-10T12:16:01.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -20,8 +20,6 @@ matrix:
     - jdk: oraclejdk11
     - jdk: openjdk8
     - jdk: openjdk11
-    - jdk: openjdk12
-    - jdk: openjdk13
     - jdk: openjdk14
     - jdk: openjdk-ea
   allow_failures:
