Remove broken jdk version in travis

.travis.yml

@@ -14,26 +14,13 @@ matrix:
   # On Linux, run with specific JDKs only.
   - os: linux
     env: CUSTOM_JDK="oraclejdk8"
-  - os: linux
-    env: CUSTOM_JDK="oraclejdk7"
-  - os: linux
-    env: CUSTOM_JDK="openjdk7"
 
 before_install:
   - echo 'MAVEN_OPTS="$MAVEN_OPTS -Xmx1024m -XX:MaxPermSize=512m -XX:+BytecodeVerificationLocal"' >> ~/.mavenrc
   - cat ~/.mavenrc
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then export JAVA_HOME=$(/usr/libexec/java_home); fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then jdk_switcher use "$CUSTOM_JDK"; fi
 
-#os:
-#  - linux
-#  - osx
-#jdk:
-#  - oraclejdk8
-#  - oraclejdk7
-#  - openjdk7
-
-
 script:
   - travis_retry mvn -B clean apache-rat:check
   - travis_retry mvn -B package jacoco:report coveralls:report