Added maven.compiler.release property

Author: exceptionfactory

pom.xml

@@ -46,6 +46,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
+        <maven.compiler.release>8</maven.compiler.release>
         <maven.checkstyle.plugin.version>3.1.2</maven.checkstyle.plugin.version>
         <maven.clean.plugin.version>3.1.0</maven.clean.plugin.version>
         <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>