Add a (Stryker) mutation score badge in the README

Author: 0xced

README.md

@@ -1,6 +1,6 @@
 **Serilog.Formatting.Log4Net** is an add-on for [Serilog](https://serilog.net/) to format log events as [log4net](https://logging.apache.org/log4net/) or [log4j](https://logging.apache.org/log4j/) compatible XML format.
 
-[![NuGet](https://img.shields.io/nuget/v/Serilog.Formatting.Log4Net.svg?label=NuGet&logo=NuGet)](https://www.nuget.org/packages/Serilog.Formatting.Log4Net/) [![Continuous Integration](https://img.shields.io/github/actions/workflow/status/serilog-contrib/serilog-formatting-log4net/continuous-integration.yml?branch=main&label=Continuous%20Integration&logo=GitHub)](https://github.com/serilog-contrib/serilog-formatting-log4net/actions/workflows/continuous-integration.yml) [![Coverage](https://img.shields.io/codecov/c/github/serilog-contrib/serilog-formatting-log4net?label=Coverage&logo=Codecov&logoColor=f5f5f5)](https://codecov.io/gh/serilog-contrib/serilog-formatting-log4net) [![Code Quality](https://img.shields.io/codacy/grade/d53b6a7664504544bc6638da641bf979?label=Code%20Quality&logo=Codacy)](https://app.codacy.com/gh/serilog-contrib/serilog-formatting-log4net)
+[![NuGet](https://img.shields.io/nuget/v/Serilog.Formatting.Log4Net.svg?label=NuGet&logo=NuGet)](https://www.nuget.org/packages/Serilog.Formatting.Log4Net/) [![Continuous Integration](https://img.shields.io/github/actions/workflow/status/serilog-contrib/serilog-formatting-log4net/continuous-integration.yml?branch=main&label=Continuous%20Integration&logo=GitHub)](https://github.com/serilog-contrib/serilog-formatting-log4net/actions/workflows/continuous-integration.yml) [![Coverage](https://img.shields.io/codecov/c/github/serilog-contrib/serilog-formatting-log4net?label=Coverage&logo=Codecov&logoColor=f5f5f5)](https://codecov.io/gh/serilog-contrib/serilog-formatting-log4net) [![Code Quality](https://img.shields.io/codacy/grade/d53b6a7664504544bc6638da641bf979?label=Code%20Quality&logo=Codacy)](https://app.codacy.com/gh/serilog-contrib/serilog-formatting-log4net) [![Mutation Score](https://img.shields.io/endpoint?url=https%3A%2F%2Fbadge-api.stryker-mutator.io%2Fgithub.com%2Fserilog-contrib%2Fserilog-formatting-log4net%2Fmain&logo=data:image/svg+xml;base64,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%3D)](https://dashboard.stryker-mutator.io/reports/github.com/serilog-contrib/serilog-formatting-log4net/main)
 
 You can use [Log4View](https://www.log4view.com) to look at log files produced with this formatter.