Tweak library name.

README.md

 * [Sylius](http://www.sylius.com/) - 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.
-* [Money](https://github.com/sebastianbergmann/money) - Another library for working with monetary values.
+* [Sebastian Money](https://github.com/sebastianbergmann/money) - Another library for working with monetary values.
 * [Swap](https://github.com/florianv/swap) - An exchange rates library.
 
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