v0.8.0

What's Changed

• Bump ex_doc from 0.29.0 to 0.29.1 by @dependabot in #21
• Bump excoveralls from 0.15.0 to 0.15.1 by @dependabot in #22
• fix min/max length validator by @phcurado in #23
• Runtime schema by @phcurado in #24

Full Changelog: v0.7.1...v0.8.0