Update ajv to the latest version 🚀

[greenkeeper]

The dependency ajv was updated from 6.8.1 to 6.9.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for v6.9.0

OpenAPI keyword nullable can be any boolean (and not only true).
Custom keyword definition changes:

• dependencies option in to require the presence of keywords in the same schema.
• more strict validation of the definition using JSON Schema.

Commits

The new version differs by 14 commits.

• cd404c4 6.9.0
• 7079aed remove property in custom keyword definition schema
• c89ca0e eslint option
• 47c8fc9 refactor: use json schema to validate custom keyword definition
• 33d1ac4 style fix
• fdfbd44 feat: support for required dependencies of custom keyword (keywords that must be present in the same schema)
• f080c91 docs: double quotes
• 51e858e docs: clarify "format" option values
• 0cf6e98 Merge branch 'mattpolzin-nullable-can-be-false'
• ac2221a style fix
• c5b9516 Merge branch 'master' into nullable-can-be-false
• 58879a0 fix: pin jshint to 2.9.7 (#939)
• 859259e Add tests that show that with nullable option on but 'nullable' keyword set to false an object is not nullable.
• 28c85ad Allow nullable property of JSON Schema object to be false as well as true. Remove test that asserted failure if nullable was false.

See the full diff

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[greenkeeper]

• The dependency ajv was updated from 6.8.1 to 6.9.1.

Update to this version instead 🚀