Bump jsonschema from 2.6.0 to 3.0.0

[dependabot-preview]

Bumps jsonschema from 2.6.0 to 3.0.0.

Changelog

Sourced from jsonschema's changelog.

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

• 21838cd Don't allow accessing DEFAULT_TYPES on new style validators.
• be0d098 Add propertyNames to Draft6 patternProperties, do not skip patternProperties ...
• e109f7c Add a test for $ref's validation details.
• 1890ec1 Be less specific about what exception gets raised here.
• 7073d53 Hooray typos.
• 540e0fa Lie less.
• e6ea397 Release notes.
• 0994b18 Go away.
• 8a8daa8 No need for a matrix build anymore.
• 2387d08 Drop support for Python 3.4.
• Additional commits viewable in compare view

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