docs: fix format

phnx47 · phnx47 · commit d39072e72b7c · 2021-04-30T00:23:22.000+07:00
diff --git a/README.md b/README.md
@@ -16,7 +16,7 @@ Extension for [Prometheus.Client](https://github.com/PrometheusClientNet/Prometh
 
 ```sh
 dotnet add package Prometheus.Client.MetricServer
-``
+```
 
 ## Use
 

-Original file line number
+Diff line change
 ```sh
 dotnet add package Prometheus.Client.MetricServer
 -``
 +```
 ## Use