Added Coveralls status

Author: arbitrarybytes

README.md

@@ -5,3 +5,4 @@ A .NET Standard 2.0 library consisting of a ton of very useful C# extension meth
 
 [![Build status](https://ci.appveyor.com/api/projects/status/5i2gmikvtr3fiyw9/branch/master?svg=true)](https://ci.appveyor.com/project/arbitrarybytes/arbitrary-extensions/branch/master) [![BCH compliance](https://bettercodehub.com/edge/badge/arbitrarybytes/arbitrary-extensions?branch=master)](https://bettercodehub.com/)
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