Update dependency attrs to v18.2.0

This MR contains the following updates:

Package	Update	Change
attrs (changelog)	minor	==18.1.0 -> ==18.2.0

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Release Notes

python-attrs/attrs

v18.2.0

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Deprecations

• Comparing subclasses using <, >, <=, and >= is now deprecated. The docs always claimed that instances are only compared if the types are identical, so this is a first step to conform to the docs.

  Equality operators (== and !=) were always strict in this regard. #​394

Changes

• attrs now ships its own PEP 484 type hints. Together with mypy's attrs plugin, you've got all you need for writing statically typed code in both Python 2 and 3!

  At that occasion, we've also added narrative docs about type annotations in attrs. #​238

• Added kw_only arguments to attr.ib and attr.s, and a corresponding kw_only attribute to attr.Attribute. This change makes it possible to have a generated __init__ with keyword-only arguments on Python 3, relaxing the required ordering of default and non-default valued attributes. #​281, #​411

• The test suite now runs with hypothesis.HealthCheck.too_slow disabled to prevent CI breakage on slower computers. #​364, #​396

• attr.validators.in_() now raises a ValueError with a useful message even if the options are a string and the value is not a string. #​383

• attr.asdict() now properly handles deeply nested lists and dictionaries. #​395

• Added attr.converters.default_if_none() that allows to replace None values in attributes. For example attr.ib(converter=default_if_none("")) replaces None by empty strings. #​400, #​414

• Fixed a reference leak where the original class would remain live after being replaced when slots=True is set. #​407

• Slotted classes can now be made weakly referenceable by passing @attr.s(weakref_slot=True). #​420

• Added cache_hash option to @attr.s which causes the hash code to be computed once and stored on the object. #​426

• Attributes can be named property and itemgetter now. #​430

• It is now possible to override a base class' class variable using only class annotations. #​431

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