Quart-rate-limiter

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* Bugfix cast Redis result to float.

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* Allow routes to be marked as rate exempt.
* Bugfix redis storage type.

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* Add optional default limits to be applied to all routes.
* Allow for an entire blueprint to be limited.
* Allow a list of limits when adding rate limits (rather than using
multiple decorators).

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* Support Python 3.8.
* RateLimitExceeded now inherits from TooManyRequests in Quart.

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* Released initial alpha version.