chore(deps-dev): update attrs requirement from ~=21.1.0 to ~=21.2.0

[dependabot-preview]

Updates the requirements on attrs to permit the latest version.

Release notes

Sourced from attrs's releases.

21.2.0

Yesterday's 21.1.0 has unfortunately two regressions that we're fixing with today's 21.2.0 release:

• The new recursive mode for attr.evolve() broke some use cases.
• attrs is not importable under Python 3.4 anymore. While 3.4 hasn't been supported for a while now, we don't want it throw errors after installation.

We've reverted the changes to attr.evolve() and added packaging metadata blocking Python 3.4.

Additionally, we are yanking 21.1.0 from PyPI. If you've pinned attrs to 21.1.0, this does not affect you in any way.

Changelog

Sourced from attrs's changelog.

21.2.0 (2021-05-07)

Backward-incompatible Changes

• We had to revert the recursive feature for attr.evolve() because it broke some use-cases -- sorry! #806
• Python 3.4 is now blocked using packaging metadata because attrs can't be imported on it anymore. To ensure that 3.4 users can keep installing attrs easily, we will yank 21.1.0 from PyPI. This has no consequences if you pin attrs to 21.1.0. #807

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21.1.0 (2021-05-06)

Deprecations

• The long-awaited, much-talked-about, little-delivered import attrs is finally upon us!

  Since the NG APIs have now been proclaimed stable, the next release of attrs will allow you to actually import attrs. We're taking this opportunity to replace some defaults in our APIs that made sense in 2015, but don't in 2021.

  So please, if you have any pet peeves about defaults in attrs's APIs, now is the time to air your grievances in #487! We're not gonna get such a chance for a second time, without breaking our backward-compatibility guarantees, or long deprecation cycles. Therefore, speak now or forever hold you peace! #487

• The cmp argument to attr.s() and attr.ib() has been undeprecated It will continue to be supported as syntactic sugar to set eq and order in one go.

  I'm terribly sorry for the hassle around this argument! The reason we're bringing it back is it's usefulness regarding customization of equality/ordering.

  The cmp attribute and argument on attr.Attribute remains deprecated and will be removed later this year. #773

Changes

• It's now possible to customize the behavior of eq and order by passing in a callable. #435, #627

• The instant favorite next-generation APIs are not provisional anymore!

  They are also officially supported by Mypy as of their 0.800 release.

  We hope the next release will already contain an (additional) importable package called attrs. #668, #786

• If an attribute defines a converter, the type of its parameter is used as type annotation for its corresponding __init__ parameter.

  If an attr.converters.pipe is used, the first one's is used. #710

• Fixed the creation of an extra slot for an attr.ib when the parent class already has a slot with the same name. #718

• __attrs__init__() will now be injected if init=False, or if auto_detect=True and a user-defined __init__() exists.

  This enables users to do "pre-init" work in their __init__() (such as super().__init__()).

  __init__() can then delegate constructor argument processing to self.__attrs_init__(*args, **kwargs). #731

• bool(attr.NOTHING) is now False. #732

• It's now possible to use super() inside of properties of slotted classes. #747

• Allow for a __attrs_pre_init__() method that -- if defined -- will get called at the beginning of the attrs-generated __init__() method. #750

• Added forgotten attr.Attribute.evolve() to type stubs. #752

... (truncated)

Commits

• 83d3cd7 Prepare 21.2.0
• f83dabb That comma is not necessary
• 744a790 Clarify yanking of 21.1
• 8076287 Create 807.breaking.rst
• 966c220 Declare Python 3.4 as incompatible (#807)
• f10d050 Revert recursive evolve (#806)
• 24a2c1e Start new cycle
• See full diff in compare view

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