Update build to look at oss staging repository. Switch to JDK11.

Signed-off-by: Roman Grigoriadi <roman.grigoriadi@oracle.com>

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 53ce1bc..24b7090 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk9
+  - oraclejdk11
 
 cache:
   directories:
@@ -11,4 +11,4 @@
 install: true
 
 script:
-- mvn -U -C clean verify
+- mvn -U -C -Pstaging clean verify