Stop testing with open jdk 6

Build errors galore
2015-10-31 13:53:31 -04:00 · 2015-10-31 13:53:31 -04:00 · 4bb917e596
Commit 4bb917e596
--- a/.travis.yml
+++ b/.travis.yml
@ -2,7 +2,6 @@ language: java
 jdk:
  - oraclejdk8
  - oraclejdk7
-  - openjdk6
 script: mvn clean test -U
 before_install: cd ProtocolLib
 install: true