Updated the maven-enforcer-plugin (#19)

Updated the maven-enforcer-plugin to 3.0.0-M3 to enable Java version detection to be successful in later versions of Java.

Author: volmasoft

pom.xml

@@ -253,6 +253,11 @@
           <artifactId>maven-checkstyle-plugin</artifactId>
           <version>3.1.0</version>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-enforcer-plugin</artifactId>
+          <version>3.0.0-M3</version>
+        </plugin>
         <plugin>
           <groupId>com.github.ekryd.sortpom</groupId>
           <artifactId>sortpom-maven-plugin</artifactId>