Bump maven-checkstyle-plugin from 2.17 to 3.0.0

Author: Fokko

pom.xml

@@ -2550,12 +2550,17 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
-        <version>2.17</version>
+        <version>3.0.0</version>
         <configuration>
           <failOnViolation>false</failOnViolation>
           <includeTestSourceDirectory>true</includeTestSourceDirectory>
-          <sourceDirectories>${basedir}/src/main/java,${basedir}/src/main/scala</sourceDirectories>
-          <testSourceDirectory>${basedir}/src/test/java</testSourceDirectory>
+          <sourceDirectories>
+            <directory>${basedir}/src/main/java</directory>
+            <directory>${basedir}/src/main/scala</directory>
+          </sourceDirectories>
+          <testSourceDirectories>
+            <directory>${basedir}/src/test/java</directory>
+          </testSourceDirectories>
           <configLocation>dev/checkstyle.xml</configLocation>
           <outputFile>${basedir}/target/checkstyle-output.xml</outputFile>
           <inputEncoding>${project.build.sourceEncoding}</inputEncoding>