4.0.0-alpha3

What's Changed

• Add access to belongs_many_many relation by @bummzack in #394
• NEW: Force low-level errors to throw in dev by @unclecheese in #397
• NEW: DBField arguments, Enum, Composite support by @unclecheese in #398

Full Changelog: 4.0.0-alpha2...4.0.0-alpha3