Fix #218: add MacPorts to the mix

README.md

@@ -169,6 +169,7 @@ Intrigued? Find out [HOW](https://github.com/jarun/nnn/wiki/performance-factors)
 - [FreeBSD](https://www.freshports.org/misc/nnn) (`pkg install nnn`)
 - [Gentoo](https://packages.gentoo.org/packages/app-misc/nnn) (`emerge nnn`)
 - [macOS/Homebrew](http://formulae.brew.sh/formula/nnn) (`brew install nnn`)
+- [MacPorts](https://www.macports.org/ports.php?by=name&substr=nnn) (`port install nnn`)
 - [Milis Linux](https://notabug.org/milislinux/milis/src/master/talimatname/genel/n/nnn/talimat) (`mps kur 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`)