weather: forecast up to 10 days

This service needs api key. For now I put it straightly into the url
It will need to be replaced, like in perl with {{ENV_APIKEY}} , but not sure if python supports this. Gonna look at it deeply.

Signed-off-by: Adrian Matejov <a.matejov@centrum.sk>
This is a bit ambiguous name. What I'd suggest is something like `get_json_or_timeout`. The thing is that `get_json` (conceptually) is precisely what `requests.get` is already doing. What I see in the body of this function is returning `None` on timeout.