docs: update readme - add how to change hostname

Author: prabashbala

README.md

@@ -78,7 +78,7 @@ Navigate to `http://localhost:4200/`. The app will automatically reload if you c
 You can configure the default HTTP port and the one used by the LiveReload server with two command-line options :
 
 ```bash
-ng serve --port 4201 --live-reload-port 49153
+ng serve --host 0.0.0.0 --port 4201 --live-reload-port 49153
 ```
 
 ### Generating Components, Directives, Pipes and Services