Allows access to air quality data from the API of the OpenAQ platform < https://docs.openaq.org/>, with the different services the API offers (getting measurements for a given query, getting latest measurements, getting lists of available countries/cities/locations).
adds longitude, latitude and coordinates arguments to aq_latest, aq_locations and aq_measurements.
adds attribution, source_name and averaging_period arguments to aq_measurements.
aq_measurements, now outputs the right local time and not the UTC time for locations behind UTC time.NEWS.md file to track changes to the package.