docs: remove out of date comment (#8)

@hboutemy The comment is both wrong and redundant with the properties.
diff --git a/pom.xml b/pom.xml
index 2303247..4ba1df3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -934,7 +934,6 @@
   <build>
     <pluginManagement>
       <plugins>
-        <!-- The Maven universe targets Java 5 minimum, with generics -->
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-plugin-plugin</artifactId>