v1.4.0

• Drop support for Ruby 2.2 and 2.3, which are no longer officially supported (@timrogers)
• Test against Ruby 2.6 (@timrogers)
• Convert "nulls" in the source data, expressed as "\N", to Ruby nils (@gabebw)

v1.3.0

• Expose the time zone that an airport is located in with #tz_name (@gabebw)

v1.2.0

• Drop support for Ruby 2.2, which has reached end-of-life and no longer receives security updates (@timrogers)
• Enforce code style using Rubocop (@timrogers)

v1.1.0

• Add new .find_by_icao_code for finding airports by their ICAO code (@ryanburnett)