Update Solidus demo link on E-commerce

README.md

@@ -588,7 +588,7 @@ _CMS are a practical way to setup a website with many features. CMS often come w
 - [Saleor](http://getsaleor.com/) - Django based open-sourced e-commerce storefront. ([Demo](https://demo.getsaleor.com/), [Source Code](https://github.com/mirumee/saleor)) `BSD-3-Clause` `Python`
 - [Shuup](https://www.shuup.com/) - Django powered fully customizable open source e-commerce framework for small and large sites. ([Source Code](https://github.com/shuup/shuup)) `AGPL-3.0` `Python`
 - [Shopware Community Edition](https://shopware.com/community/) - PHP based open source e-commerce software made in Germany. ([Demo](https://www.shopware.com/en/test-demo/), [Source Code](https://github.com/shopware/platform)) `MIT` `PHP`
-- [Solidus](https://solidus.io/) - A free, open-source ecommerce platform that gives you complete control over your store. ([Demo](http://solidemo.herokuapp.com/), [Source Code](https://github.com/solidusio/solidus)) `BSD-3-Clause` `Ruby`
+- [Solidus](https://solidus.io/) - A free, open-source ecommerce platform that gives you complete control over your store. ([Demo](http://demo.solidus.io/), [Source Code](https://github.com/solidusio/solidus)) `BSD-3-Clause` `Ruby`
 - [Spree Commerce](https://spreecommerce.org) - Spree is a complete, modular & API-driven open source e-commerce solution for Ruby on Rails. ([Demo](http://new-ux.spreecommerce.org/), [Source Code](https://github.com/spree/spree)) `BSD-3-Clause` `Ruby`
 - [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-3.0` `PHP`