Bump jsonschema from 2.6.0 to 3.1.1

[dependabot-preview]

Bumps jsonschema from 2.6.0 to 3.1.1.

Changelog

Sourced from jsonschema's changelog.

v3.1.0

• Regular expressions throughout schemas now respect the ECMA 262 dialect, as recommended by the specification (#609).

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

• 7ee391c Revert "Respect ECMA regex syntax for schemas."
• ccdeeb3 Sigh. reST tools fight, go!
• b5ed4ef Spelling.
• 4d9764e No need for make now.
• 077feca Changelog bump.
• 2c4390a Update the docs to point to draft 7 in the Sphinx role.
• 00ee84b Add a version specifically for the role, and declare we're safe in parallel.
• 1a02f54 Respect ECMA regex syntax for schemas.
• cbb222c Merge commit '8012a786ff8ab4f57c8e128f458c4061540f1983'
• 8012a78 Squashed 'json/' changes from 2d554504..4e6c78b4
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #65.