def fetch(options)
      timestamps = build_timestamps(options)
      params = { T: timestamps.join(","), c: nil }
      query(params)
    end
def fetch(options)
      timestamps = build_timestamps(options)
      params = { T: timestamps.join(","), c: nil }
      query(params)
    end
The base_url should look something like
 this: 'http://egauge12345.egaug.es'
 The options hash should have 3 keys defined:
 1. :timestamp [Timestamp] - This is the point in time
    from which to fetch past readings. The "latest" reading
    will be the beginning of the current period breakdown.
    For instance if the timestamp is 2018-10-20 13:06 and
    the breakdown is hourly, the latest reading will be
    from 2018-10-20 13:00
 2. :breakdown [Symbol] - This defines the time period
    between the readings. This can be :hour, :day or :month
 3. :count [Integer] - Number of past readings to fetch

 This method returns an array of hashes with these values
   - "Date & Time" (An integer representing time since epoch)
   - "Usage [kWh]"
   - "Generation [kWh]"
   - "Solar [kWh]"
   - "Solar+ [kWh]"