update readme

Author: phnx47

README.md

@@ -4,10 +4,9 @@
 [![nuget](https://img.shields.io/nuget/v/Prometheus.Client.DependencyInjection?logo=nuget&style=flat-square)](https://www.nuget.org/packages/Prometheus.Client.DependencyInjection)
 [![nuget](https://img.shields.io/nuget/dt/Prometheus.Client.DependencyInjection?logo=nuget&style=flat-square)](https://www.nuget.org/packages/Prometheus.Client.DependencyInjection)
 [![codecov](https://img.shields.io/codecov/c/github/prom-client-net/prom-client-dependencyinjection?logo=codecov&style=flat-square)](https://app.codecov.io/gh/prom-client-net/prom-client-dependencyinjection)
-[![codefactor](https://img.shields.io/codefactor/grade/github/prom-client-net/prom-client-dependencyinjection?logo=codefactor&style=flat-square)](https://www.codefactor.io/repository/github/prom-client-net/prom-client-dependencyinjection)
 [![license](https://img.shields.io/github/license/prom-client-net/prom-client-dependencyinjection?style=flat-square)](https://github.com/prom-client-net/prom-client-dependencyinjection/blob/main/LICENSE)
 
-## Installation
+## Install
 
 ```shell
 dotnet add package Prometheus.Client.DependencyInjection