Update README.md

Author: haath

README.md

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-[Chance.js](http://chancejs.com) port into native C# targetting portable .NET Standard.
+[Chance.js](http://chancejs.com) port into native C# targetting .NET Standard.
 
 This project aims to mimic the original chance.js api as closely as possible while adapting 
 it to C# types and practices. For example using enums for options and returning regular objects