Changelog for azimuth-hs-0.2.1

# Changelog - 0.2.1 (2020-08-13) * Allows the specification of optional transaction parameters via Urbit.Azimuth.runAzimuth' (note the apostrophe). * The chain ID must now be passed explicitly to the Urbit.Azimuth.Account.toPrivateKey helper (previously it defaulted to 1). - 0.2.0 (2020-08-13) * Generalizes account types to include hs-web3's 'DefaultAccount' and 'PersonalAccount', in addition to the existing 'LocalKeyAccount'. - 0.1.0 (2020-07-14) * Initial release. Supports the Azimuth and Ecliptic contracts, basic account management, and basic transaction submission.