Merge pull request #139 from pjedrzejewski/patch-1

Fix the link to Sylius project

README.md

 
 * [OmniPay](https://github.com/adrianmacneil/omnipay) - A framework agnostic multi-gateway payment processing library.
 * [Payum](https://github.com/payum/payum) - A payment abstraction library.
-* [Sylius](http://www.sylius.com/) - An open source e-commerce solution.
+* [Sylius](http://www.sylius.org/) - An open source e-commerce solution.
 * [Thelia](http://thelia.net/v2/) - Another open source e-commerce solution.
 * [Money](https://github.com/mathiasverraes/money) - A PHP implementation of Fowler's money pattern.
 * [Sebastian Money](https://github.com/sebastianbergmann/money) - Another library for working with monetary values.