Aiozipkin

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* More strict typing configuration is used 147
* Fixed bunch of typos in code and docs 151 153 (thanks deejay1)
* Added interface for Transport 155 (thanks deejay1)
* Added create_custom helper for easer tracer configuration 160 (thanks deejay1)
* Added interface for Sampler 160 (thanks deejay1)
* Added py.typed marker

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* Add more coverage with typing 147
* Breaking change: typo send_inteval => send_interval 144 (thanks gugu)
* Breaking change: do not append api/v2/spans to the zipkin dress 150

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* Add support http.route tag for aiohttp 138
* Make zipkin address builder more permissive 141 (thanks dsantosfff)

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* Breaking change: az.create is coroutine now 114
* Added context manger for tracer object 114
* Added more mypy types 117

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* Added new_child helper method 83

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After few months of work and beta releases here are basic features:

* Initial release.
* Implemented zipkin v2 protocol with HTTP transport
* Added jaeger support
* Added stackdriver support
* Added aiohttp server support
* Added aiohttp 3.0.0 client tracing support
* Added examples and demos