Bump jsonschema from 2.6.0 to 3.0.2

[dependabot-preview]

Bumps jsonschema from 2.6.0 to 3.0.2.

Changelog

Sourced from jsonschema's changelog.

v3.0.2

• Fixed a bug where 0 and False were considered equal by const and enum (#575).

v3.0.1

• Fixed a bug where extending validators did not preserve their notion of which validator property contains $id information.

v3.0.0

• Support for Draft 6 and Draft 7
• Draft 7 is now the default
• New TypeChecker object for more complex type definitions (and overrides)
• Falling back to isodate for the date-time format checker is no longer attempted, in accordance with the specification

Commits

• d594635 Tense and issue link.
• af42f33 Changelog.
• 27eb5d2 And now fix enum.
• 1598940 Unskip and fix the const-related compare bug.
• 584c72a Use the awpa 3.7 branch until we merge it.
• 76a6c52 Skip the failing #575 tests until it's fixed.
• a39ed5a Merge commit '2024cbfe74024a1ded9daa679b218fe3255b6635'
• 2024cbf Squashed 'json/' changes from 812ba486..c09f995c
• e4fa34f Py2 argparse sends version to stderr.
• 47fcb39 Remove CPython2 from AppVeyor.
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #63.