Update to spring-framework 5.1.14.RELEASE on Travis CI

Fixes gh-449

Author: kazuki43zoo

.travis.yml

@@ -9,7 +9,7 @@ jdk:
 
 script:
   - ./mvnw clean verify
-  - ./mvnw clean verify -Dspring.version=5.1.12.RELEASE -Dspring-batch.version=4.1.3.RELEASE
+  - ./mvnw clean verify -Dspring.version=5.1.14.RELEASE -Dspring-batch.version=4.1.3.RELEASE
 
 after_success:
   - chmod -R 777 ./travis/after_success.sh