Update Homebrew README link

README.md

@@ -19,7 +19,7 @@ Usage
 
 * Arch Linux: [community/zsh-completions](https://www.archlinux.org/packages/zsh-completions) / [AUR/zsh-completions-git](https://aur.archlinux.org/packages/zsh-completions-git/)
 * [Gentoo](http://packages.gentoo.org/package/app-shells/zsh-completions)
-* Mac OS: [Homebrew](https://github.com/mxcl/homebrew/blob/master/Library/Formula/zsh-completions.rb)
+* Mac OS: [Homebrew](https://github.com/Homebrew/homebrew-core/blob/master/Formula/zsh-completions.rb)
 * Debian based distributions (Debian/Ubuntu/Linux Mint...): Packager needed, please get in touch !
 * RPM based distributions (Fedora/RHEL/CentOS...): Packager needed, please get in touch !