rollback checkstyle plugin version

Author: Crim

pom.xml

@@ -155,7 +155,7 @@
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-checkstyle-plugin</artifactId>
- <version>3.1.1</version>
+ <version>3.0.0</version>
  <executions>
  <execution>
  <id>checkstyle-validate</id>