Bump ajv from 6.12.0 to 6.12.2

Created by: dependabot-preview[bot]

Bumps ajv from 6.12.0 to 6.12.2.

Release notes

Sourced from ajv's releases.

v6.12.2

Removed post-install script

v6.12.1

Docs and dependency updates

Commits

• 6a67105 6.12.2
• 14bdb4b remove postinstall
• b511ae2 6.12.1
• 5354deb Merge branch 'opencollective-opencollective'
• 891f081 update readme
• bc60f57 Merge branch 'master' into opencollective
• f1ca328 Merge pull request #1191 from epoberezkin/greenkeeper/karma-sauce-launcher-4.1.3
• 3e9f375 Update package.json
• 0b641fe Merge branch 'master' into greenkeeper/karma-sauce-launcher-4.1.3
• db9e73a Merge pull request #1187 from epoberezkin/greenkeeper/karma-5.0.0
• Additional commits viewable in compare view

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