Flask-injector

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* Fixed Flask 2.2.0+ compatibility, thanks to Valentin Baert

Backwards incompatible:

* Dropped support for Flask older than 2.2.0

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* Infrastructure contributions thanks to ZHANG Cheng
* Fixed all known Flask/Werkzeug compatibility issues

Backwards incompatible:

* Dropped Python 3.6 support
* Flask >= 2.1.2 is now required
* Injector >= 0.20.0 is now required

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* Improved Werkzeug/Flask 2.0 compatibility (fixed the "RuntimeError: Working outside of request context" error)

Backwards incompatible:

* Dropped Python 3.5 support
* Dropped flask_restplus support (the library hasn't been usable with Werkzeug 1.0+)

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* Fixed injecting into blueprint-associated teardown_request handlers

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* Added Flask-RESTX integration (48, thanks to Michael Bukachi)

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* Stopped unnecessarily installing typing on recent Python versions (thanks to Louis Trezzini)
* Fixed injecting request-scoped dependencies into teradown_request handlers (fix suggested
by Nick Krichevsky)
* Added PEP 561 py.typed marker so that tools know to use type hints in the package's source