…220)

* Implement rule B020: for-loop control variable overrides iter set

* Update tests/b020.py

Co-authored-by: Cooper Lees <me@cooperlees.com>

* B021: f-string used as docstring.

* Update README.rst

* Update bugbear.py

Co-authored-by: Zac Hatfield-Dodds <zac.hatfield.dodds@gmail.com>

* There are more docstrings than just triple double quotes!

Co-authored-by: Zac Hatfield-Dodds <zac.hatfield.dodds@gmail.com>

* Add B019 check to find cache decorators on class methods

* B019: Change decorator resolution approach to retain lineno

Starting in Python 3.8, the function node definition's `lineno` is changed to index its `def ...` line rather than the first line where its decorators start. This causes inconsistent line numbers across Python versions for the line reported by Flake8.

We can use the decorator node location instead, which provides a consistent location, and makes sense because this hits on decorators.

* Update README verbiage

* Prefer `extend-select` and `extend-ignore` for configuring opinionated warnings (`B9`)
* Add deprecation note for Bugbear's internal handling of whether or not to emit `B9` codes
* Add an example for `extend-immutable-call` specification

* B9: Make Bugbear aware of flake8's `extend-select`

* The code for Bugbear's built-in filtering for opinionated warnings predates the addition of `extend-select` to flake8 (`v4.0`) so it's not part of the check for explicit specification of `B9` codes.
* Switch from `Mock` to `argparse.Namespace` for specifying options to tests to match the incoming type from `flake8` and avoid mocking side-effects.

* Style fixes from review

Co-authored-by: Cooper Ry Lees <me@cooperlees.com>

Co-authored-by: Cooper Ry Lees <me@cooperlees.com>

* B022: No arguments passed to contextlib.suppress
  * Update README.rst
  * Disclaimer note on rule scope

* B006 and B008: Cover additional test cases

* Add change log entry
* Account for inconsistent ast between python versions
* Use ast.literal_eval to simplify infinity float detection

* Ignore black formatting for b013 test case

* Ack, needed to updated expected test result lineno

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 22.1.0 → 22.3.0](psf/black@22.1.0...22.3.0)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update b013.py

Re add brackets

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Cooper Lees <me@cooperlees.com>