ReactiveX / RxPY / 1465

93%

master: 93%

Pull #460

travis-ci

Fixed flat_map with mapper returning an asyncio Future

As of python 3.7 Asyncio Futures implement an __iter__ method,
probably for backward compatibility. As a consequence, asyncio
futures are also iterable. So we must check if the mapper result
is a Future before checking if it is Iterable.

Fixes #457

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