Update README.md

Author: artdolya

README.md

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 RabbitMQ Target for popular NLog logging tool
 
 [![NuGet](https://img.shields.io/nuget/v/Nlog.RabbitMQ.Target.svg)](https://www.nuget.org/packages/Nlog.RabbitMQ.Target/)
+[![Bump version](https://github.com/artdolya/Nlog.RabbitMQ/actions/workflows/bump.yml/badge.svg)](https://github.com/artdolya/Nlog.RabbitMQ/actions/workflows/bump.yml)
 
 ## Minimum Recommended Configuration