remove PHP QR Code

not a web application, see https://github.com/Kickball/awesome-selfhosted/pull/637

README.md

@@ -151,7 +151,6 @@ See also [Static Site Generators](#static-site-generators), [Content Management
    * [Firefox Sync Server](https://docs.services.mozilla.com/howtos/run-sync-1.5.html) - Sync Firefox bookmarks, passwords, history, tabs, preferences. ([Source Code](https://github.com/mozilla-services/syncserver)) `MPLv2` `Python`
   * [Lobsters](https://lobste.rs) - Run your own link aggregation site. ([Source Code](https://github.com/jcs/lobsters)) `BSD` `Ruby`
   * [No Fuss Bookmarks](http://nofussbm.herokuapp.com/signup.html) - Very simple software and service to store bookmarks especially designed for hackers (that don't need fancy interfaces, but nice API). ([Source Code](https://github.com/mapio/nofussbm)) `GPLv3` `Python`
-  * [PHP QR Code](http://phpqrcode.sourceforge.net/) - PHP QR Code is open source (LGPL) library for generating QR Code, 2-dimensional barcode. ([Demo](http://phpqrcode.sourceforge.net/#demo), [Source Code](https://sourceforge.net/projects/phpqrcode/)) `LGPLv3` `PHP`
   * [Pinry](http://getpinry.com/) - The tiling image board system for people who want to save, tag, and share images, videos, and webpages. ([Source Code](https://github.com/pinry/pinry)) `BSD` `Python`
   * [Shaarli](https://github.com/shaarli/Shaarli) - Personal, minimalist, super-fast, no-database bookmarking and link sharing plaform. ([Demo](http://shaarlidemo.tuxfamily.org/Shaarli/) `demo/demo`) `Zlib` `PHP`
   * [unmark](https://unmark.it/) - An open source to do app for links. ([Source Code](https://github.com/plainmade/unmark)) `MIT` `PHP`