Update dependency future to v0.18.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
future (source)	==0.18.2 -> ==0.18.3

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Release Notes

PythonCharmers/python-future (future)

v0.18.3

Compare Source

This is a minor bug-fix release containing a number of fixes:

• Backport fix for bpo-38804 (c91d70b)
• Fix bug in fix_print.py fixer (dffc579)
• Fix bug in fix_raise.py fixer (3401099)
• Fix newint bool in py3 (fe645ba)
• Fix bug in super() with metaclasses (6e27aac)
• docs: fix simple typo, reqest -> request (974eb1f)
• Correct eq (c780bf5)
• Pass if lint fails (2abe00d)
• Update docker image and parcel out to constant variable. Add comment to update version constant (45cf382)
• fix order (f96a219)
• Add flake8 to image (046ff18)
• Make lint.sh executable (58cc984)
• Add docker push to optimize CI (01e8440)
• Build System (42b3025)
• Add docs build status badge to README.md (3f40bd7)
• Use same docs requirements in tox (18ecc5a)
• Add docs/requirements.txt (5f9893f)
• Add PY37_PLUS, PY38_PLUS, and PY39_PLUS (bee0247)
• fix 2.6 test, better comment (ddedcb9)
• fix 2.6 test (3f1ff7e)
• remove nan test (4dbded1)
• include list test values (e3f1a12)
• fix other python2 test issues (c051026)
• fix missing subTest (f006cad)
• import from old imp library on older python versions (fc84fa8)
• replace fstrings with format for python 3.4,3.5 (4a687ea)
• minor style/spelling fixes (8302d8c)
• improve cmp function, add unittest (0d95a40)
• Pin typing==3.7.4.1 for Python 3.3 compatiblity (1a48f1b)
• Fix various py26 unit test failures (9ca5a14)
• Add initial contributing guide with docs build instruction (e55f915)
• Add docs building to tox.ini (3ee9e7f)
• Support NumPy's specialized int types in builtins.round (b4b54f0)
• Added r""" to the docstring to avoid warnings in python3 (5f94572)
• Add subclasscheck for past.types.basestring (c9bc0ff)
• Correct example in README (681e78c)
• Add simple documentation (6c6e3ae)
• Add pre-commit hooks (a9c6a37)
• Handling of next and next by future.utils.get_next was reversed (52b0ff9)
• Add a test for our fix (461d77e)
• Compare headers to correct definition of str (3eaa8fd)
• #​322 Add support for negative ndigits in round; additionally, fixing a bug so that it handles passing in Decimal properly (a4911b9)
• Add tkFileDialog to future.movers.tkinter (f6a6549)
• Sort before comparing dicts in TestChainMap (6126997)
• Fix typo (4dfa099)
• Fix formatting in "What's new" (1663dfa)
• Fix typo (4236061)
• Avoid DeprecationWarning caused by invalid escape (e4b7fa1)
• Fixup broken link to external django documentation re: porting to Python 3 and unicode_literals (d87713e)
• Fixed newdict checking version every time (99030ec)
• Add count from 2.7 to 2.6 (1b8ef51)

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