Sanic-prometheus

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* Add websocket support (SirEdwin)
* Add http_status label to request latency metric (mmniaziqb)

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Add multiprocessing support

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FIX: remove early return that kills other middlewares.

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Starting from 0.5.0 Sanic has http[s]:// prefix
in request.url, switch to using request.path instead.

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First public version of sanic-prometheus