Update attrs to 18.2.0

[pyup-bot]

This PR updates attrs from 17.4.0 to 18.2.0.

Changelog

18.2.0

-------------------

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.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.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.com/python-attrs/attrs/issues/281>`_,
`411 <https://github.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.com/python-attrs/attrs/issues/364>`_,
`396 <https://github.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.com/python-attrs/attrs/issues/383>`_
- ``attr.asdict()`` now properly handles deeply nested lists and dictionaries.
`395 <https://github.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.com/python-attrs/attrs/issues/400>`_,
`414 <https://github.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.com/python-attrs/attrs/issues/407>`_
- Slotted classes can now be made weakly referenceable by passing ``attr.s(weakref_slot=True)``.
`420 <https://github.com/python-attrs/attrs/issues/420>`_
- Added *cache_hash* option to ``attr.s`` which causes the hash code to be computed once and stored on the object.
`425 <https://github.com/python-attrs/attrs/issues/425>`_
- Attributes can be named ``property`` and ``itemgetter`` now.
`430 <https://github.com/python-attrs/attrs/issues/430>`_
- It is now possible to override a base class' class variable using only class annotations.
`431 <https://github.com/python-attrs/attrs/issues/431>`_


----

18.1.0

-------------------

Changes
^^^^^^^

- ``x=X(); x.cycle = x; repr(x)`` will no longer raise a ``RecursionError``, and will instead show as ``X(x=...)``.

`95 <https://github.com/python-attrs/attrs/issues/95>`_
- ``attr.ib(factory=f)`` is now syntactic sugar for the common case of ``attr.ib(default=attr.Factory(f))``.

`178 <https://github.com/python-attrs/attrs/issues/178>`_,
`356 <https://github.com/python-attrs/attrs/issues/356>`_
- Added ``attr.field_dict()`` to return an ordered dictionary of ``attrs`` attributes for a class, whose keys are the attribute names.

`290 <https://github.com/python-attrs/attrs/issues/290>`_,
`349 <https://github.com/python-attrs/attrs/issues/349>`_
- The order of attributes that are passed into ``attr.make_class()`` or the *these* argument of ``attr.s()`` is now retained if the dictionary is ordered (i.e. ``dict`` on Python 3.6 and later, ``collections.OrderedDict`` otherwise).

Before, the order was always determined by the order in which the attributes have been defined which may not be desirable when creating classes programatically.

`300 <https://github.com/python-attrs/attrs/issues/300>`_,
`339 <https://github.com/python-attrs/attrs/issues/339>`_,
`343 <https://github.com/python-attrs/attrs/issues/343>`_
- In slotted classes, ``__getstate__`` and ``__setstate__`` now ignore the ``__weakref__`` attribute.

`311 <https://github.com/python-attrs/attrs/issues/311>`_,
`326 <https://github.com/python-attrs/attrs/issues/326>`_
- Setting the cell type is now completely best effort.
This fixes ``attrs`` on Jython.

We cannot make any guarantees regarding Jython though, because our test suite cannot run due to dependency incompatabilities.

`321 <https://github.com/python-attrs/attrs/issues/321>`_,
`334 <https://github.com/python-attrs/attrs/issues/334>`_
- If ``attr.s`` is passed a *these* argument, it will no longer attempt to remove attributes with the same name from the class body.

`322 <https://github.com/python-attrs/attrs/issues/322>`_,
`323 <https://github.com/python-attrs/attrs/issues/323>`_
- The hash of ``attr.NOTHING`` is now vegan and faster on 32bit Python builds.

`331 <https://github.com/python-attrs/attrs/issues/331>`_,
`332 <https://github.com/python-attrs/attrs/issues/332>`_
- The overhead of instantiating frozen dict classes is virtually eliminated.
`336 <https://github.com/python-attrs/attrs/issues/336>`_
- Generated ``__init__`` methods now have an ``__annotations__`` attribute derived from the types of the fields.

`363 <https://github.com/python-attrs/attrs/issues/363>`_
- We have restructured the documentation a bit to account for ``attrs``' growth in scope.
Instead of putting everything into the `examples <https://www.attrs.org/en/stable/examples.html>`_ page, we have started to extract narrative chapters.

So far, we've added chapters on `initialization <https://www.attrs.org/en/stable/init.html>`_ and `hashing <https://www.attrs.org/en/stable/hashing.html>`_.

Expect more to come!

`369 <https://github.com/python-attrs/attrs/issues/369>`_,
`370 <https://github.com/python-attrs/attrs/issues/370>`_


----

Links

• PyPI: https://pypi.org/project/attrs
• Changelog: https://pyup.io/changelogs/attrs/
• Homepage: https://www.attrs.org/

[codecov-io]

Codecov Report

Merging #41 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #41   +/-   ##
====================================
  Coverage      30%   30%           
====================================
  Files           3     3           
  Lines          10    10           
====================================
  Hits            3     3           
  Misses          7     7

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[pyup-bot]

Closing this in favor of #92