An in-range update of ajv is breaking the build 🚨 about helix-embed HOT 5 CLOSED

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.

The new version differs by 23 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.
• 6d4b31e 6.8.1

There are 23 commits in total.

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The new version differs by 11 commits.

• 2aa49ae 6.9.2
• dffe473 chore(package): update mocha to version 6.0.0 (#952)
• 6831b68 feat: extract method to validate custom keyword definition
• 187e021 fix: removeAdditional option breaking custom keywords, closes #955, closes epoberezkin/ajv-keywords#91
• f6d25de Replace single quotes with double quotes to get build scripts running on Windows (#946)
• c52f2e1 update package.json scripts
• 098df6d test: enable browser tests in node 10
• 8720547 skip browser tests
• a7f78f2 refactor: split issues.spec.js file
• 71dc5dc refactor: split options.spec.js file
• 51685b8 chore(package): update nyc to version 13.2.0 (#930)

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Option strictDefaults to report ignored defaults (#957, @not-an-aardvark)
Option strictKeywords to report unknown keywords (#781)

The new version differs by 8 commits.

• 6c20483 6.10.0
• 38d1acd refactor: strictDefaults option
• e993bd6 feat: strictKeywords option to report unknown keywords, closes #781
• 9a28689 style: fix
• 18268c5 additional tests for strictDefault options
• 4b76519 Merge branch 'not-an-aardvark-invalidDefaults-option'
• 88199d5 rename option to strictDefaults
• c081061 feat: invalidDefaults option to warn when defaults are ignored, fixes #957

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