use scala.binary.version to specify directories

Author: kiszk

pom.xml

@@ -2611,8 +2611,8 @@
         <artifactId>spotbugs-maven-plugin</artifactId>
         <version>3.1.3</version>
         <configuration>
-          <classFilesDirectory>${basedir}/target/scala-2.11/classes</classFilesDirectory>
-          <testClassFilesDirectory>${basedir}/target/scala-2.11/test-classes</testClassFilesDirectory>
+          <classFilesDirectory>${basedir}/target/scala-${scala.binary.version}/classes</classFilesDirectory>
+          <testClassFilesDirectory>${basedir}/target/scala-${scala.binary.version}/test-classes</testClassFilesDirectory>
           <effort>Max</effort>
           <threshold>Low</threshold>
           <xmlOutput>true</xmlOutput>