Hacking-Git: improve wording with s/that/who/

Author: chriscool

Hacking-Git.md

@@ -68,7 +68,7 @@ suggest improvements. Thanks!
 
 * [git-series](https://github.com/git-series/git-series) helps manage patch series.
 
-* [git-related](https://github.com/felipec/git-related) finds people that might be interested in a patch.
+* [git-related](https://github.com/felipec/git-related) finds people who might be interested in a patch.
 
 ## Development status