Prevent build error of maven-bundle-pluin on JDK 15

Author: kazuki43zoo

.travis.yml

@@ -7,6 +7,11 @@ jdk:
   - openjdk11
   - openjdk8
 
+jobs:
+  allow_failures:
+    # Fail maven-bundle-plugin on JDK 15 (https://issues.apache.org/jira/browse/FELIX-6259,https://github.com/mybatis/parent/issues/160)
+    - jdk: openjdk15
+
 after_success:
   - chmod -R 777 ./travis/after_success.sh
   - ./travis/after_success.sh