modify travis.yml with trusty

modify travis.yml with trusty

Author: DivyaDosibhatla

.travis.yml

@@ -4,14 +4,9 @@ addons:
   apt:
     packages:
       - openjdk-6-jdk
-matrix:
-  include:
-    - env: JDK='OpenJDK 6'
-      before_install:
-        - echo "MAVEN_OPTS='-Dlicense.skip=true'" > ~/.mavenrc
-        - TRAVIS_JDK_VERSION=openjdk6
-        - export _JAVA_OPTIONS=-Dhttps.protocols=TLSv1,TLSv1.1,TLSv1.2
+before_install:
+  - jdk_switcher use openjdk6
 jdk:
-  - oraclejdk8
-  - openjdk7
   - openjdk6
+  - openjdk7
+  - oraclejdk8