Tweaked readme.

Author: Oren (electricessence)

README.md

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 A set of extensions for optimizing/simplifying System.Threading.Channels usage.
 
-[![NuGet](http://img.shields.io/nuget/v/Open.ChannelExtensions.svg)](https://www.nuget.org/packages/Open.ChannelExtensions/)
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 [Click here for detailed documentation.](https://electricessence.github.io/Open.ChannelExtensions/api/Open.ChannelExtensions.Extensions.html#methods)
 
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 ## Highlights
 
 Being able to define an asynchronous pipeline with best practice usage using simple expressive syntax: