add pretix ticket sales platform for events

README.md

@@ -475,6 +475,7 @@ _Recipe management_
   * [OXID eShop](http://oxidforge.org) - OXID eShop is a flexible open source e-commerce software with a wide range of functionalities. ([Demo](http://demoshop.oxid-esales.com/community-edition/), [Source Code](https://github.com/OXID-eSales/oxideshop_ce)) `GPLv3` `PHP`
   * [Open Food Network](https://openfoodnetwork.org/) - An online marketplace for local food. It enables a network of independent online food stores that connect farmers and food hubs with individuals and local businesses. ([Source Code](https://github.com/openfoodfoundation/openfoodnetwork)) `AGPLv3` `Ruby`
   * [PrestaShop](https://www.prestashop.com/) - PrestaShop offers a free, open-source and fully scalable e-commerce solution. ([Demo](http://demo.prestashop.com/), [Source Code](https://github.com/PrestaShop/PrestaShop)) `OSLv3` `PHP`
+  * [Pretix](https://pretix.eu/) - Django based ticket sales platform for events ([Source Code](https://github.com/pretix)) `Apache` `Python`
   * [Shuup](https://www.shuup.com/) - Django powered fully customizable open source e-commerce framework for small and large sites. ([Demo](https://www.shuup.com/en/demo/), [Source Code](https://github.com/shuup/shuup)) `AGPLv3` `Python`
   * [Sylius](http://sylius.org/) - Symfony2 powered open source full-stack platform for eCommerce. ([Demo](http://sylius.org/demo), [Source Code](https://github.com/Sylius/Sylius)) `MIT` `PHP`
   * [Thelia](http://thelia.net/) - Thelia is an open source and flexible e-commerce solution. ([Demo](http://demo.thelia.net/), [Source Code](https://github.com/thelia/thelia)) `LGPL` `PHP`