v0.6.0

What's Changed

• Technical/Update project docs by @bestwebua in #84
• Technical/Update license by @bestwebua in #85
• Technical/Update Ruby version, dependencies by @bestwebua in #87
• Technical/Update changelog, version by @bestwebua in #88
• Truemail server v0.6.0 by @bestwebua in #89

Full Changelog: v0.5.0...v0.6.0