Bump ajv from 6.6.2 to 6.8.1

Created by: dependabot-preview[bot]

Bumps ajv from 6.6.2 to 6.8.1.

Release notes

Sourced from ajv's releases.

v6.8.0

Docs: security considerations. Meta-schema for the security assessment of JSON Schemas.

v6.7.0

Option useDefaults: "empty" to replace null and "" (empty strings) with default values (in addition to assigning defaults to missing and undefined properties). Update draft-04 meta-schema to remove incorrect usage of "uri" format.

Commits

• 6d4b31e 6.8.1
• b9f8507 6.8.0
• e6c1e53 docs: security
• aced0cc refactor: security meta-schema
• a9e03c5 docs: js syntax highlight
• 4031b6a test: schema security
• 334071a docs: security considerations
• 0bf7d38 docs: option defaults for "empty" properties, closes #927
• 0c31c1e docs: transfer notice
• 38a9ad4 6.7.0
• Additional commits viewable in compare view

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