Release v0.9.3

What's Changed

• Make lazy param traceable when raising ConfigurationError by @altescy in #34
• Bump gitpython from 3.1.29 to 3.1.30 by @dependabot in #33
• Update dependencies by @altescy in #36
• Support abstract classes by @altescy in #37
• Bump version number to v0.9.3 by @altescy in #38

Full Changelog: v0.9.2...v0.9.3