Changing the scala version for scala-maven-plugin

Since version 2.7 of the plugin, the scala version to use is detected from dependency to scala-library. So it suggested to not use scalaVersion configuration. But if you want to define explicitly the version of scala used to compile,... use 'scalaVersion', ex:

                <plugin>        <groupId>net.alchim31.maven</groupId>        <artifactId>scala-maven-plugin</artifactId>        <version>3.2.1</version>        <executions>          <execution>            <goals>              <goal>compile</goal>              <goal>testCompile</goal>            </goals>          </execution>        </executions>        <configuration>          <scalaVersion>${scala.version}</scalaVersion>        </configuration>      </plugin>