Bump version to v2.2.0

Bump version to v2.1.0

Release v2

Fix typo

Replace `.clone()` with `.copy()`:

I don't know how I let that one slip past, I must've been half asleep.

Bump version to v1.26.0

Don't emit FURB135/FURB148 when using `_` in comprehensions (#312):

Closes #311.

See #311 (comment)
for a detailed explaination of the problem and how I went about fixing it.

Add `simplify-hashlib-ctor` check:

Also bump version for new release.

Pin Mypy to <1.7.0 (#306):

Temporarily fixes #305.

Specifically, this error is being caused by this line:

https://github.com/python/mypy/blob/e4355948d797600c7b76da0a916fc5f29d10448e/mypy/traverser.py#L97

Because `TraverserVisitor` now is a `trait` you cannot extend from it. There
doesn't seem to be a way to get around this on my end, so I'm pinning Mypy as a
workaround until I find a solution or something changes upstream with Mypy.

Skip files that raise `RecursionError` (#304):

Certain deeply-nested expressions cause the Refurb visitor to blow the stack.
This doesn't seem to be an issue when running with Mypy directly, though this
is probably because we are traversing the entire AST. As a workaround we will
silently ignore files that cause this issue. For debugging purposes there
should probably be a flag to show files that have been ignored (perhaps just
stuff it under the `-v` flag for now).

Also bump version for new release.

Closes #302.