International Space Station tracker Async/Await

Display the position of the ISS (International Space Station) on a map.
The map is created with leaflet.js (code already available in the script).
Also display the coordinates (rounded to 6 decimal places) and the country over which the ISS is located.

1. Locate ISS
   • Fetch, every 5 seconds, the position of the ISS from: https://api.wheretheiss.at/v1/satellites/25544
   • Update the lat and lng values of the iss object
   • Call de function updateIssMarker() to update the map
2. Find the country over which the ISS flies
   • Use OpenStreetMaps reverse geocoding service to search for the country e.g:
     Thomas More - campus Geel
     Atlantic ocean
     
   • Update the country value of the iss object (set the value to 'unknown' if no country was found)
   • Display the coordinates and the country in the green box above the map
3. Custom marker (optional)
   • Find an icon that matches the theme and replace the default marker with this icon
   • Info: https://leafletjs.com/examples.html