maven-compiler-plugin: set release parameter to 8

For JDK 9+, this should pass the --release option to the javac
executable which is the preferred form. The source/target options
remain available for building with Java 8.

Author: sbesson

pom.xml

@@ -213,11 +213,12 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.7.0</version>
+        <version>3.14.0</version>
         <!-- Require the Java 8 platform. -->
         <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
+          <release>8</release>
+          <source>8</source>
+          <target>8</target>
         </configuration>
       </plugin>