Bump mock-open from 1.3.1 to 1.4.0

[dependabot-preview]

Bumps mock-open from 1.3.1 to 1.4.0.

Release notes

Sourced from mock-open's releases.

v1.4.0

Changed

• Moved library code under the src/ directory.
• Copied over the original CPython's unittest.mock.mock_open tests (with some modifications) as part of the library's test suite. This brought up a few differences in the API and usage to light which were fixed as part of this release.

Fixed

• Allow to omit the mode argument, since the builtin open will understand this as 'r'.
• Reset position in the file-like mock in consecutive calls to a patched open (either a direct call or when used as a context manager).
• Define FileLikeMock as an iterator, which was an API of the builtin open it was missing:

  with patch('builtins.open', new_callable=MockOpen) as mock_open:
      mock_open.return_value.read_data = 'SOME DATA'
      with open('/some/path') as f:
          assert 'SOME DATA' == next(f)

v1.3.2

Changed

• Added TravisCI integration.

Fixed

• Issue #7: Side effect now returns unittest.mock.DEFAULT.
• Fixed compatibility issue with AsyncMock changes in 3.8.

Commits

• 3ce2bc9 Bump to v1.4.0
• 19d9220 Add CPython original mock_open test cases
• e06f414 Define FileLikeMock as an iterator
• 6d08c1b Reset position on consecutive call to mocked open
• f484e56 Allow omitting mode argument
• 0d3380b Move library code under src directory
• dddf428 Update tox config
• d043756 Update badges on README.md
• 1dad5d3 Bump to v1.3.2
• e01c9b8 Generalize mock call
• Additional commits viewable in compare view

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