rsync: Recommend Homebrew or MacPorts rsync for macOS

Bundled `rsync` is 2.6.x which is too old. Prefer 3.2.x from Homebrew
or MacPorts instead.

modules/rsync/README.md

@@ -3,8 +3,8 @@ Rsync
 
 Defines [rsync][1] aliases.
 
-macOS users are encouraged to use [Bombich's rsync][2], which has HFS+
-enhancements.
+macOS users are encouraged to use *rsync* from [Homebrew][2] or [MacPorts][3],
+which has additional enhancements including patches from [Bombich][4].
 
 Aliases
 -------
@@ -18,10 +18,12 @@ Aliases
 Authors
 -------
 
-*The authors of this module should be contacted via the [issue tracker][3].*
+*The authors of this module should be contacted via the [issue tracker][5].*
 
   - [Sorin Ionescu](https://github.com/sorin-ionescu)
 
-[1]: http://rsync.samba.org
-[2]: https://bombich.com/kb/ccc5/credits#rsync
-[3]: https://github.com/sorin-ionescu/prezto/issues
+[1]: https://rsync.samba.org
+[2]: https://github.com/Homebrew/homebrew-core
+[3]: https://ports.macports.org/port/rsync
+[4]: https://bombich.com/kb/ccc5/credits#rsync
+[5]: https://github.com/sorin-ionescu/prezto/issues