Fix Travis

Author: pitbulk

.travis.yml

@@ -1,8 +1,19 @@
 language: java
-jdk:
-  - openjdk7
-  - openjdk8
-#  - oraclejdk7 #It seems oraclejdk7 temp fail on Travis
+matrix:
+  include:
+  - os: linux
+    dist: precise
+    jdk: openjdk7
+  - os: linux
+    dist: precise
+    jdk: oraclejdk7
+  - os: linux
+    dist: trusty
+    jdk: openjdk8
+  - os: linux
+    dist: trusty
+    jdk: oraclejdk8
+
 install: true
 after_success:
   - mvn clean verify org.jacoco:jacoco-maven-plugin:report org.eluder.coveralls:coveralls-maven-plugin:report