Upgrade to Modernizer Maven Plugin 2.1.0

Changelog:

https://github.com/gaul/modernizer-maven-plugin/releases/tag/modernizer-maven-plugin-2.1.0
https://github.com/gaul/modernizer-maven-plugin/releases/tag/modernizer-maven-plugin-2.0.0
https://github.com/gaul/modernizer-maven-plugin/releases/tag/modernizer-maven-plugin-1.9.0
https://github.com/gaul/modernizer-maven-plugin/releases/tag/modernizer-maven-plugin-1.8.0

pom.xml

@@ -277,7 +277,7 @@
       <plugin>
         <groupId>org.gaul</groupId>
         <artifactId>modernizer-maven-plugin</artifactId>
-        <version>1.8.0</version>
+        <version>2.1.0</version>
         <executions>
           <execution>
             <id>modernizer</id>