0.6.0

What's Changed

• chore(cargo): bump serde_json from 1.0.78 to 1.0.79 by @dependabot in #200
• add new delivery error by @ayrat555 in #201
• chore(cargo): bump mockito from 0.30.0 to 0.31.0 by @dependabot in #202
• ci(actions): bump actions/checkout from 2.4.0 to 3 by @dependabot in #203
• chore(cargo): bump isahc from 1.6.0 to 1.7.0 by @dependabot in #204
• chore(cargo): bump handlebars from 4.2.1 to 4.2.2 by @dependabot in #205
• add content fields by @ayrat555 in #206

Full Changelog: 0.5.0...0.6.0