v0.2.0

Changed

• SHT4X regularly polls temperature and humidity at 5 second intervals
  (configurable). Regular polling is required for temperature compensation
  algorithms.
• The SHT4X.measure/1 function is now SHT4X.get_sample/1 to reflect that it
  returns the latest sample rather than polling the sensor. The SHT4X.Measurement
  struct contains a timestamp and quality information to indicate how stale it
  is. Staleness could be due to communication issues with the sensor or just
  waiting for the next poll time.
• The sensor's serial number is not polled on init. This means that I2C failures
  or retry delays won't delay or fail startup. They likely will affect the
  regular polling if they don't resolve themselves.

Added

• SHT4X.serial_number/1 to get the sensor's unique serial number
• The sensor is immediately polled for a temperature. Previously the first
  temperature measurement was delayed until the interval timer expired (default 5
  seconds).