Merge pull request #477 from kazuki43zoo/update-spring-version-on-travis

Upgrade to spring 5.1.15 and spring-batch 4.1.4 on Travis CI

Author: kazuki43zoo

.travis.yml

@@ -14,7 +14,7 @@ jobs:
 
 script:
   - ./mvnw clean verify
-  - ./mvnw clean verify -Dspring.version=5.1.14.RELEASE -Dspring-batch.version=4.1.3.RELEASE
+  - ./mvnw clean verify -Dspring.version=5.1.15.RELEASE -Dspring-batch.version=4.1.4.RELEASE
 
 after_success:
   - chmod -R 777 ./travis/after_success.sh