[Feature Request] Recursive reload from a directory

[zhouzhuojie]

Hi,

Wondering if reload can support recursive subdirectory from a directory.

reload/reload.go

Lines 54 to 55 in ed43622

	// Dir is an additional directory to watch for changes. Directories are watched
	// non-recursively.

[arp242]

Yeah, don't mind accepting patches for this. Maybe as a new ListDirs(path string, cb func()) []Dir function which scans a directory. You can then do reload.Do(log.Print, cb, reload.ListDirs("./tpl", reloadTpl)...).