Fix #216: remove outdated PPA

README.md

@@ -180,7 +180,6 @@ Intrigued? Find out [HOW](https://github.com/jarun/nnn/wiki/performance-factors)
 - [Source Mage](http://codex.sourcemage.org/test/shell-term-fm/nnn/) (`cast nnn`)
 - [Termux](https://github.com/termux/termux-packages/tree/master/packages/nnn) (`pkg in nnn`)
 - [Ubuntu](https://packages.ubuntu.com/search?keywords=nnn&searchon=names&exact=1) (`apt-get install nnn`)
-- [Ubuntu PPA](https://launchpad.net/~twodopeshaggy/+archive/ubuntu/jarun/) (`apt-get install nnn`)
 - [Void Linux](https://github.com/void-linux/void-packages/tree/master/srcpkgs/nnn) (`xbps-install -S nnn`)