describe that homebrew is installer for macOS

Hardly a person to use macOS and this familiar with homebrew search by homebrew

README.md

@@ -155,7 +155,7 @@ Intrigued? Find out [HOW](https://github.com/jarun/nnn/wiki/performance-factors)
 - [Fedora](https://apps.fedoraproject.org/packages/nnn) (`dnf install nnn`)
 - [FreeBSD](https://www.freshports.org/misc/nnn) (`pkg install nnn`)
 - [Gentoo](https://packages.gentoo.org/packages/app-misc/nnn) (`emerge nnn`)
-- [Homebrew](http://formulae.brew.sh/formula/nnn) (`brew install nnn`)
+- [macOS/Homebrew](http://formulae.brew.sh/formula/nnn) (`brew install nnn`)
 - [NixOS](https://github.com/NixOS/nixpkgs/tree/master/pkgs/applications/misc/nnn) (`nix-env -i nnn`)
 - [OpenBSD](https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/sysutils/nnn/) (`pkg_add nnn`)
 - [openSUSE](https://software.opensuse.org/package/nnn) (and packages for several other distros) (`zypper in nnn`)