changed help flag setup to use PersistenFlags so -h will be supported

command.go

@@ -637,7 +637,7 @@ func (c *Command) Flags() *flag.FlagSet {
 			c.flagErrorBuf = new(bytes.Buffer)
 		}
 		c.flags.SetOutput(c.flagErrorBuf)
-		c.flags.BoolVar(&c.helpFlagVal, "help", false, "help for "+c.Name())
+		c.PersistentFlags().BoolVarP(&c.helpFlagVal, "help", "h", false, "help for "+c.Name())
 	}
 	return c.flags
 }