Add type annotations with Mypy checks.#33

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Dreamsorcerer wants to merge 29 commits intomasterfrom

Commits on Aug 3, 2020

Add type annotations with Mypy checks.
Dreamsorcerer
committed

Commits on Dec 10, 2020

Use more general connection error.
Dreamsorcerer
committed

Commits on Dec 16, 2020

Commits on Dec 17, 2020

Change Coroutine to Awaitable.
Dreamsorcerer
committed