Overview

Drop support for Flask 1
- This decision comes because flask 1 is no longer being supported upstream and a recent dependency change they released made it difficult to continue testing both versions for compatibility.
Add verify_type argument to view decorators to allow accepting both refresh & access tokens #460 (thanks @tgross35)
Adds type hinting and MyPy support
Documentation improvements (thanks @wjjmjh and @Udit107710)
Relax dependency pinning for cryptography package (#467)

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