B912: check if map calls have strict flag

[kasium]

Closes #516

[Copilot]

Pull Request Overview

Adds a new flake8-bugbear check (B912) to require an explicit strict= parameter on calls to map() when more than one iterable is provided.

• Implements check_for_b912 in bugbear.py and registers the new error.
• Adds tests in tests/eval_files/b912_py314.py to cover valid and invalid map() usages.
• Updates README.rst with documentation and changelog entry for B912.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/eval_files/b912_py314.py	New test cases for B912 rule; checks map calls.
bugbear.py	Added check_for_b912 and registered B912 error.
README.rst	Documented B912 and added changelog entry.

Comments suppressed due to low confidence (1)

tests/eval_files/b912_py314.py:2

• The *map("c") expression is invalid since map() requires a function argument. If you intend to expand a single-character iterable, use *"c" or a list (e.g., *["c"]).

map(lambda x: x, "a", "b", *map("c"))  # B912: 0