Bump attrs from 17.4.0 to 18.2.0

[dependabot-preview]

Bumps attrs from 17.4.0 to 18.2.0.

Changelog

Sourced from attrs's changelog.

18.2.0 (2018-09-01)

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 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/394>_

Changes
^^^^^^^

• attrs now ships its own PEP 484 <https://www.python.org/dev/peps/pep-0484/>_ type hints.
  Together with mypy <http://mypy-lang.org>_'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 <https://www.attrs.org/en/stable/types.html>_ about type annotations in attrs.
  #238 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/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 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/281>,
  #411 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/411>

• The test suite now runs with hypothesis.HealthCheck.too_slow disabled to prevent CI breakage on slower computers.
  #364 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/364>,
  #396 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/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 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/383>_

• attr.asdict() now properly handles deeply nested lists and dictionaries.
  #395 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/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 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/400>,
  #414 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/414>

• Fixed a reference leak where the original class would remain live after being replaced when slots=True is set.
  #407 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/407>_

• Slotted classes can now be made weakly referenceable by passing [**attr**](https://github.com/attr).s(weakref_slot=True).
  #420 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/420>_

• Added cache_hash option to [**attr**](https://github.com/attr).s which causes the hash code to be computed once and stored on the object.
  #425 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/425>_

• Attributes can be named property and itemgetter now.
  #430 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/430>_

• It is now possible to override a base class' class variable using only class annotations.
  #431 <https://github-redirect.dependabot.com/python-attrs/attrs/issues/431>_

---

... (truncated)

Commits

• aaeba93 Prepare 18.2.0
• 839a605 Changelog polishes
• 15643ae Link types docs from attr.ib's type argument docs
• ad16cd3 Get rid of slangy anymore
• 5b866d3 Fix note in stubs (#440)
• 73ae718 Consistently use "base class" and "subclass" (#436)
• 1268219 Use consistently autodoc syntax for arguments
• 4a83c93 Make _Nothing a singleton (#433)
• 746f047 Allow to override class vars of super classes w/ annotations (#431)
• 7fe111c T325 weakref with slots (#420)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #17   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          52     52           
=====================================
  Hits           52     52

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[dependabot-preview]

Superseded by #28.