Issue #1077 - Travis build fails due to JDK exception

* Removed the Oracle JDK, to avoid a security issue with the Sonatype repo

Author: ppodgorsek

.travis.yml

@@ -4,6 +4,5 @@ jdk:
   - openjdk9
   - openjdk10
   - openjdk11
-  - oraclejdk10
 script:  mvn clean test
 env: MAVEN_OPTS=" -Xmx2048m -Xms768m -XX:MaxPermSize=512m"