0.6.1

What's Changed

• enable Atom to be the key in a HashTable by @arvidn in #386
• precalculate SHA256 hashes. Speed-up: 1.2x by @arvidn in #387
• add generated test cases for the sha256 operator by @arvidn in #388
• Updated License by @ChiaAutomation in #389
• fix warnings of unused use-statements by @arvidn in #390
• bump version to 0.6.1 by @arvidn in #392

Full Changelog: 0.6.0...0.6.1