Bump ajv from 6.9.1 to 6.9.2

Created by: dependabot-preview[bot]

Bumps ajv from 6.9.1 to 6.9.2.

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 ep...
• f6d25de Replace single quotes with double quotes to get build scripts running on Wind...
• 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
• Additional commits viewable in compare view

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