Merge pull request #58 from codehaus-plexus/dependabot/maven/org.apache.maven.plugins-maven-checkstyle-plugin-3.1.1

Author: dependabot[bot]

pom.xml

@@ -651,7 +651,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-checkstyle-plugin</artifactId>
-            <version>2.15</version>
+            <version>3.1.1</version>
             <configuration>
               <configLocation>config/maven_checks.xml</configLocation>
               <headerLocation>config/maven-header.txt</headerLocation>