minor update of README.md

hacknus · hacknus · commit 3f7bbeb9b977 · 2023-05-08T08:32:54.000+02:00
diff --git a/README.md b/README.md
@@ -56,7 +56,7 @@ Error: glib-2.0 was not found in the pkg-config search path.
 
 solved through
 
-```
+```sh
 sudo apt-get install libgtk-3-dev
 ```
 
