MAINT: Bump pycodestyle from 2.5.0 to 2.6.0

[dependabot-preview]

Bumps pycodestyle from 2.5.0 to 2.6.0.

Changelog

Sourced from pycodestyle's changelog.

2.6.0 (2020-05-11)

Announcements:

• Anthony Sottile (@asottile) joined the team as a core developer. 🎉

Changes:

• E306: fix detection inside async def. PR #929.
• E301: fix regression disallowing decorated one-liners. PR #927.
• E714: fix false positive with chained is not. PR #931.

2.6.0a1 (2020-04-23)

New checks:

• E225: require whitespace around and in is and or. PR #847.

Changes:

• E117: fix indentation using tabs by treating as 8-space indents. PR #837.
• E721: fix false positive with names containg istype. PR #850.
• E741: allow l as a named argument in a function call. PR #853.
• E302: fix false-negative with decorated functions. PR #859.
• W504: ellipsis (...) is no longer treated as a binary operator. PR #875.
• E402: allow with, if, elif, else to guard imports. PR #834.
• Add support for assignment expressions := (PEP 572). PR #879.
• Add support for positional-only arguments / (PEP 570). PR #872, #918.
• Add support for python 3.8.
• Add support for matrix multiplication operator @ (PEP 465). PR #897.
• Support visual indent for continuation lines for with / assert / raise. PR #912.
• E302: allow two blank lines after a block of one-liners. PR #913.
• E302: allow two-and-fewer newlines at the top of the file. PR #919.

Commits

• d414383 Simplified / cleaned up the Makefile to match Travis (just use tox)
• 203041b Announce Anthony as core developer, tweak release date.
• 4795a0e Added comment reminder of how to upload these days
• 0f42fed Bumped license year
• 7dad684 Merge pull request #933 from asottile/2_6_0
• 82b0416 2.6.0
• 1aa4c0a Merge pull request #931 from suzil/fix/767/chained-is-not-E714
• 90026af Merge pull request #927 from asottile/allow_typing_one_liners_again
• 39895aa Handle
• 5230110 E714: fix chained is not
• Additional commits viewable in compare view

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