Updated Readme

Updated supported framework

Author: amitsendinblue

README.md

@@ -15,7 +15,7 @@ This C# SDK is automatically generated by the [Swagger Codegen](https://github.c
 
 ## Frameworks supported
 - .NET Core >=1.0
-- .NET Framework >=4.6
+- .NET Framework >=4.6.1
 - Mono/Xamarin >=vNext
 - UWP >=10.0