Update README.md

changed status badge to point to dev

Author: frankodoom

README.md

@@ -10,7 +10,7 @@ A simple cross-platform offline .NET library for getting Global Country Data wit
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 | nuget downloads | [![](https://img.shields.io/nuget/dt/CountryData.Standard)](https://www.nuget.org/packages/CountryData.Standard) |
-| builds | ![.NET](https://github.com/frankodoom/CountryData.Standard/actions/workflows/dotnet.yml/badge.svg?branch=master) |
+| builds | ![.NET](https://github.com/frankodoom/CountryData.Standard/actions/workflows/dotnet.yml/badge.svg?branch=development) |
 |code coverage|[![codecov](https://codecov.io/github/frankodoom/CountryData.Net/branch/development/graph/badge.svg?token=E79CY267AR)](https://codecov.io/github/frankodoom/CountryData.Net)