Update mypy to version 0.610

[cburgdorf]

What was wrong?

Mypy was on an outdated version.

How was it fixed?

Updated to 0.610 but disabled the strict-optional check for now as our code base does not pass it yet.

Mypy highlights for that new version

• reveal_locals()
• The type of the object returned by calling an async function used to be Awaitable; it’s changed to Coroutine since such objects support calling send() and throw() on them

More in the blog post

Cute Animal Picture