Update README.md

Author: usercode

README.md

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-# AsyncLock
+# AsyncKeyLock
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://opensource.org/licenses/MIT)
+[![NuGet](https://img.shields.io/nuget/v/AsyncKeyLock.Core.svg?style=flat-square)](https://www.nuget.org/packages/AsyncKeyLock/)
 
 ## Async Key-based ReaderWriterLock with cancellation support