Add Honduras (real-time total production)

[alixunderplatz]

Regarding the regions in Central America, we were still lacking electricity production of Honduras (HN).
This data however is included on the ENTE-website as real-time "total generation".
https://www.enteoperador.org/flujos-regionales-en-tiempo-real/

I have used this data for the category "unknown" with an average CO2-intensity of 316 g/kWh as per IEA 2017.
I implemnted fetch_production for HN in the existing ENTE parser, which is used for the Central American exchange flows.

Sample output:

fetch_production(HN) ->
{'zoneKey': 'HN', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'production': {'unknown': 918.0}, 'source': 'enteoperador.org'}
fetch_exchange(CR, PA) ->
{'sortedZoneKeys': 'CR->PA', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': -39.4, 'source': 'enteoperador.org'}
fetch_exchange(CR, NI) ->
{'sortedZoneKeys': 'CR->NI', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': 49.0, 'source': 'enteoperador.org'}
fetch_exchange(HN, NI) ->
{'sortedZoneKeys': 'HN->NI', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': 33.0, 'source': 'enteoperador.org'}
fetch_exchange(GT, MX) ->
{'sortedZoneKeys': 'GT->MX', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': -86.2, 'source': 'enteoperador.org'}
fetch_exchange(GT, SV) ->
{'sortedZoneKeys': 'GT->SV', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': 130.0, 'source': 'enteoperador.org'}
fetch_exchange(GT, HN) ->
{'sortedZoneKeys': 'GT->HN', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': 43.9, 'source': 'enteoperador.org'}
fetch_exchange(HN, SV) ->
{'sortedZoneKeys': 'HN->SV', 'datetime': datetime.datetime(2020, 1, 4, 2, 38, tzinfo=tzstr('UTC-6')), 'netFlow': 12.3, 'source': 'enteoperador.org'}