Travis: run with spring-framework 4.1.6

Author: jirutka

.travis.yml

@@ -6,7 +6,7 @@ jdk:
 env:
   - SPRING_VERSION=3.2.13.RELEASE
   - SPRING_VERSION=4.0.9.RELEASE
-  - SPRING_VERSION=4.1.4.RELEASE
+  - SPRING_VERSION=4.1.6.RELEASE
 install:
   - mvn dependency:go-offline -Dspring.version=$SPRING_VERSION --threads 5 -B -V
 script: