v4.0.0

Feature

• Remove two-step-api exceptions (f2c91c7)

Fix

• Handle recursive case issue (e72a5db)
• Allow skipping validation in internals (21748d9)

Breaking

• Not only will the two-step API not work anymore, but - Python 3.7 is no longer supported - code generation is a feature! - Render() and friends are a thing - cases try to deserialize input as json (f2c91c7)