Fix readme.md

readme.md

@@ -16,10 +16,10 @@ As a quick example, we are going to setup Docker-OSM with default values everywh
 * Put the file in the `settings` folder and rename it `country.pbf`. 
 
 Alternatively you can execute the `settings_downloader.sh` script to download the pbf and the clip file
-``
+```bash
 ./settings_downloader.sh GEOJSON_URL CONTINENT COUNTRY ie
 ./settings_downloader.sh https://github.com/kartoza/docker-osm/raw/develop/settings/clip.geojson africa south-africa
-`` 
+```
 
 If you use rancher for container management you can use the provided docker-compose.yml which allows you to automatically
 download the settings onto the host machine by using environment variables.