Remove the unused LibraryHelp command

Author: xhh

modules/swagger-codegen-cli/src/main/java/io/swagger/codegen/SwaggerCodegen.java

@@ -5,7 +5,6 @@
 import io.swagger.codegen.cmd.ConfigHelp;
 import io.swagger.codegen.cmd.Generate;
 import io.swagger.codegen.cmd.Langs;
-import io.swagger.codegen.cmd.LibraryHelp;
 import io.swagger.codegen.cmd.Meta;
 
 /**
@@ -30,8 +29,7 @@ public static void main(String[] args) {
                         Meta.class,
                         Langs.class,
                         Help.class,
-                        ConfigHelp.class,
-                        LibraryHelp.class
+                        ConfigHelp.class
                 );
 
         builder.build().parse(args).run();