Version upgrade and travis change to elastic 5.5.0

Author: cmanaha

.travis.yml

@@ -4,6 +4,16 @@ python:
   - "2.7"
   - "3.6"
 
+addons:
+  apt:
+    packages:
+      - oracle-java8-installer
+
+before_install:
+  - sudo update-java-alternatives -s java-8-oracle
+  - export JAVA_HOME=/usr/lib/jvm/java-8-oracle/jre
+  - java -version
+
 install:
   - pip install tox-travis
   - pip install codecov