Bump idna from 2.6 to 2.9

[dependabot-preview[bot]]

Bumps idna from 2.6 to 2.9.

Changelog

Sourced from idna's changelog.

2.9 (2020-02-16)

• Update to Unicode 12.1.0.
• Prohibit A-labels ending with a hyphen (Thanks, Julien Bernard!)
• Future-proofing: Test on Python 3.7 and 3.8, don't immediately fail should Python 4 come along.
• Made BSD 3-clause license clearer

2.8 (2018-12-04)

• Update to Unicode 11.0.0.
• Provide more specific exceptions for some malformed labels.

2.7 (2018-06-10)

• Update to Unicode 10.0.0.
• No longer accepts dot-prefixed domains (e.g. ".example") as valid. This is to be more conformant with the UTS 46 spec. Users should strip dot prefixes from domains before processing.

Commits

• 1233a73 Release v2.9
• a1f6bb3 Preliminary release notes for v2.9
• ac949bc Update to Unicode 12.1.0 (#75)
• ef0a187 Aid license autodetection by simplifying LICENSE file (#74)
• 1f1518b Don't break when Python 4 comes along (#73)
• ddba701 Test Python 3.7 and 3.8 on Travis (#70)
• 032fc55 Check a-label does not contain a trailing hyphen (#64)
• 1cdf175 Release v2.8
• 27fe03f Don't mask more specific exception (fixes #65)
• 0f50bdc Preliminary Unicode 11.0.0 data
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.