Update README.md

Author: giometrix

README.md

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 # TableStorage.Abstractions.TableEntityConverters
 [![Build status](https://ci.appveyor.com/api/projects/status/20rwpny4jfng24ws?svg=true)](https://ci.appveyor.com/project/giometrix/tablestorage-abstractions-tableentityconverters)
+[![Nuget dotnetcore](https://img.shields.io/badge/nuget-dotnetcore-blue.svg)](https://www.nuget.org/packages/TableStorage.Abstractions.TableEntityConverters/)
+[![Nuget dotnetcore](https://img.shields.io/badge/nuget-dotnetframework-lightgrey.svg)](https://www.nuget.org/packages/TableStorage.Abstractions.TableEntityConverters.DotNet/)
 
 Easily convert POCOs (Plain Old CLR Objects) to Azure Table Storage TableEntities and vice versa