Update pylint requirement from ==2.6.* to ==2.7.*

[dependabot[bot]]

Updates the requirements on pylint to permit the latest version.

Changelog

Sourced from pylint's changelog.

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.

• Postponed evaluation of annotations are now recognized by default if python version is above 3.10

  Closes #3992

• Fix column metadata for anomalous backslash lints

• Drop support for Python 3.5

• Add support for pep585 with postponed evaluation

... (truncated)

Commits

• 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
• ca11047 Fix link to isort documentation in doc/faq.rst
• ee91075 Migrate from % syntax or bad format() syntax to fstring
• 5bed07e Move from % string formatting syntax to f-string or .format()
• a1e553d Add pyupgrade to the pre-commit configuration
• 154718c Remove the # coding, since PEP3120 the default is UTF8
• Additional commits viewable in compare view

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[dependabot[bot]]

A newer version of pylint exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[vonNiklasson]

@dependabot recreate

[dependabot[bot]]

Superseded by #196.