docs: fix badges

Author: phnx47

README.md

@@ -6,8 +6,7 @@
 
 [![NuGet](https://img.shields.io/nuget/v/Prometheus.Client.MetricServer.svg)](https://www.nuget.org/packages/Prometheus.Client.MetricServer)
 [![NuGet](https://img.shields.io/nuget/dt/Prometheus.Client.MetricServer.svg)](https://www.nuget.org/packages/Prometheus.Client.MetricServer)
-![CI](https://img.shields.io/github/workflow/status/prom-client-net/prom-client-metricserver/%F0%9F%92%BF%20CI%20Master?label=CI&logo=github)](https://github.com/prom-client-net/prom-client-metricserver/actions/workflows/master.yml)
-[![Gitter](https://img.shields.io/gitter/room/PrometheusClientNet/community.svg)](https://gitter.im/PrometheusClientNet/community)
+[![CI](https://img.shields.io/github/workflow/status/prom-client-net/prom-client-metricserver/%F0%9F%92%BF%20CI%20Master?label=CI&logo=github)](https://github.com/prom-client-net/prom-client-metricserver/actions/workflows/master.yml)
 [![License MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://opensource.org/licenses/MIT)
 
 Extension for [Prometheus. Client](https://github.com/PrometheusClientNet/Prometheus.Client)