Allowing arbitrary key value pair in the request's URL

[AlexisPrelAER]

This pull request makes a few minor changes to expose a new optional keyword argument when invoking get_data or get_multiple_series. This shows up in the URL as key=value pairs.

Example usage:

1. specify that you want hourly data
   esios.get_data(indicator, start_date, end_date, groupby='hour')

2. specify that you want data for a specific province
   esios.get_data(indicator, start_date, end_date, geo_id=22)

[SanPen]

@JotaFan could you please review this?
It is failing the linter check

[JotaFan]

Run:

make init-dev
make lint-fix

and then commit the changes, it should pass then.
Otherwise you can merge, it is just linting

[JotaFan]

@AlexisPrelAER if you can run those commands on your local code, and commit after the changes, then it should be fine