Bump pylint from 2.4.4 to 2.7.1

[dependabot-preview[bot]]

Bumps pylint from 2.4.4 to 2.7.1.

Changelog

Sourced from pylint's changelog.

What's New in Pylint 2.7.1?

• Expose UnittestLinter in pylint.testutils

• Don't check directories starting with '.' when using register_plugins

  Closes #4119

What's New in Pylint 2.7.0?

Release date: 2021-02-21

• Introduce DeprecationMixin for reusable deprecation checks.

  Closes #4049

• Fix false positive for builtin-not-iterating when map receives iterable

  Closes #4078

• Python 3.6+ is now required.

• Fix false positive for builtin-not-iterating when zip receives iterable

• Add nan-comparison check for NaN comparisons

• Bug fix for empty-comment message line number.

  Closes #4009

• Only emit bad-reversed-sequence on dictionaries if below py3.8

  Closes #3940

• Handle class decorators applied to function.

  Closes #3882

• Add check for empty comments

• Fix minor documentation issue in contribute.rst

• Enums are now required to be named in UPPER_CASE by invalid-name.

  Close #3834

• Add missing checks for deprecated functions.

... (truncated)

Commits

• 5843f09 Change for version 2.7.1
• 818bc5b Fix benchmark test (#4138)
• 3cd5fd1 Add text in changelog for cherry-picked commit
• f719014 Expose UnittestLinter in testutils after 2.7
• 7fe8a02 Add Whatsnew in 2.7.1 in the changelog
• 5e04ce7 Better documentation for the change in version during release
• 41d7022 Upgrade the documentation about release
• ac85223 Apply copyrite --contribution-threshold
• 6e2de8e Upgrade version to 2.7.0 and fix astroid to 2.5.0
• b9d9ca2 Edit highlights for 2.7.0 in whatsnew
• Additional commits viewable in compare view

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Superseded by #275.