- rename `.*_providers` to `.*_handlers`
- change `Binary.provider: BinProviderName` to `Binary.binprovider: BinProvider`
- fix forced cast to superclass `BinProvider` because of missing `InstanceOf[]` pydantic type hint
- add `BinProvider.INSTALLER_BIN_ABSPATH`, improve pre-checks for package manager before installing
- rename `BinProvider.BIN` to `BinProvider.INSTALLER_BIN`
- rename `subdeps` to `packages`
**Full Changelog**: https://github.com/ArchiveBox/pydantic-pkgr/compare/v0.1.4...v0.2.1