Remove obsolete comment

pf4j/src/main/java/module-info.java

     // provided by the ASM library, use "requires static" since it's optional
     requires static org.objectweb.asm;
 
-    // The SLF4J library currently does not provide a module.
-    // Version 1.8 provides a module called "org.slf4j". But this version is
-    // currently in beta stage. Therefore I'm not sure, if we already like to
-    // use it.
     requires org.slf4j;
 
     // The java-semver library currently does not provide a module.