Test against 1.8.0RC1 on Travis CI

Author: jmikola

.travis.yml

@@ -22,7 +22,7 @@ cache:
 
 env:
   global:
-    - DRIVER_VERSION=1.8.0beta1
+    - DRIVER_VERSION=1.8.0RC1
     - SERVER_DISTRO=enterprise-ubuntu1604
     - SERVER_VERSION=4.2.0
     - DEPLOYMENT=STANDALONE