Update dependency astroid to v1.6.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astroid	==1.5.3 -> ==1.6.6

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Release Notes

PyCQA/astroid

v1.6.6

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v1.6.5

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v1.6.4

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v1.6.3

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v1.6.2

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v1.6.1

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v1.6.0

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Release Date: 2017-12-15

• When verifying duplicates classes in MRO, ignore on-the-fly generated classes

  Close PyCQA/pylint#​1706

• Add brain tip for attrs library to prevent unsupported-assignment-operation false positives

  Close PYCQA/pylint#​1698

• file_stream was removed, since it was deprecated for three releases

  Instead one should use the .stream() method.

• Vast improvements to numpy support

• Add brain tips for curses

  Close PyCQA/pylint#​1703

• Add brain tips for UUID.int

  Close PyCQA/pylint#​961

• The result of using object.new as class decorator is correctly inferred as instance

  Close #​172

• Enums created with functional syntax are now iterable

• Enums created with functional syntax are now subscriptable

• Don't crash when getting the string representation of BadUnaryOperationMessage

  In some cases, when the operand does not have a .name attribute,
  getting the string representation of a BadUnaryOperationMessage leads
  to a crash.

  Close PyCQA/pylint#​1563

• Don't raise DuplicateBaseError when classes at different locations are used

  For instance, one can implement a namedtuple base class, which gets reused
  on a class with the same name later on in the file. Until now, we considered
  these two classes as being the same, because they shared the name, but in fact
  they are different, being created at different locations and through different
  means.

  Close PyCQA/pylint#​1458

* The func form of namedtuples with keywords is now understood

  Close PyCQA/pylint#​1530

* Fix inference for nested calls

* Dunder class at method level is now inferred as the class of the method

  Close PyCQA/pylint#​1328

* Stop most inference tip overwrites from happening by using
	predicates on existing inference_tip transforms.

  Close #​472

* Fix object.__new__(cls) calls in classmethods by using
    a context which has the proper boundnode for the given
    argument

    Close #​404

* Fix Pathlib type inference

    Close PyCQA/pylint#​224
    Close PyCQA/pylint#​1660

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