Add Linkr (#1067)

* Add Linkr

* Add Node as secondary language

README.md

@@ -1126,6 +1126,7 @@ See https://staticsitegenerators.net and https://www.staticgen.com
 
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+  * [Linkr](https://linkrapp.com) - Beautiful, fast URL shortening. ([Demo](https://demo.linkrapp.com), [Source Code](https://github.com/LINKIWI/linkr)) `MIT` `Python/Nodejs`
   * [Lstu](https://github.com/ldidry/lstu) - _Let's SHorten That Url_ - Lightweight URL shortener. `WTFPL` `Perl`
   * [Nimbus](https://github.com/ethanal/nimbus) - A URL shortener and file sharer with a drag-and-drop OS X menu bar client and web interface. `MIT` `Python`
   * [Polr](https://project.polr.me/) - A modern, minimalist, modular, and lightweight URL shortener. ([Source Code](https://github.com/Cydrobolt/polr)) `GPLv2` `PHP`