v0.4.0 - Code base refactoring and using TOML for config

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #14
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #15
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #16
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #17
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #18
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #19
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #20
• refactor(deps): use poetry and pydantic by @jeertmans in #21

Full Changelog: v0.1.0...v0.4.0