Bump minimal puppet version to 6.0.0 in metadata.json
Bump minimal puppet version to 6.0.0 in metadata.json

markasammut/puppetlabs-mysql,puppetlabs/puppetlabs-mysql,simp/puppetlabs-mysql,markasammut/puppetlabs-mysql,puppetlabs/puppetlabs-mysql,simp/puppetlabs-mysql