Bump astroid from 1.6.5 to 2.0.3

[dependabot-preview]

Bumps astroid from 1.6.5 to 2.0.3.

Changelog

Sourced from astroid's changelog.

What's New in astroid 2.0.3?

Release Date: 2018-08-08

• The environment markers for PyPy were invalid.

What's New in astroid 2.0.2?

Release Date: 2018-08-01

• Stop repeat inference attempt causing a RuntimeError in Python3.7

  Close RuntimeError: generator raised StopIteration pylint-dev/pylint#2317

• infer_call_result can raise InferenceError so make sure to handle that for the call sites
  where it is used

 infer_call_result started recently to raise InferenceError for objects for which it
 could not find any returns. Previously it was silently raising a StopIteration,
 which was especially leaking when calling builtin methods.
 Since it is after all an inference method, it is expected that it
 could raise an InferenceError rather than returning nothing.

 Close PyCQA/pylint#2350

What's New in astroid 2.0.1?

Release Date: 2018-07-19

• Released to clear an old wheel package on PyPI

What's New in astroid 2.0?

Release Date: 2018-07-15

• String representation of nodes takes in account precedence and associativity rules of operators.

• Fix loading files with modutils.load_from_module when
  the path that contains it in sys.path is a symlink and
  the file is contained in a symlinked folder.

  Close #583

• Reworking of the numpy brain dealing with numerictypes

... (truncated)

Commits

• 900a4b8 Release 2.0.3 with correct environment markers for pypy
• 5cc50ab Prepare 2.0.2
• f0044dd infer_call_result can raise InferenceError so make sure to handle that for th...
• 2894a1a Cut obsolete "explicit StopIteration" comments
• a48aa1e Use final Python 3.7 in Travis
• b8122df Spelling fixes
• ed835c5 Fix lint error
• 8d1de50 Add test for checking that a RuntimeError is no longer emitted in Python 3.7
• 8841891 Wrap the inference functions with raise_if_nothing_inferred where we didn't h...
• fcbf256 Rename method for making it clearer
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #58.