0.6.4

• Auto upgrade foreman-maintain if new package is available (#28649)
• update ruby versions(2.4.5,2.5.3,2.6.5) in travis
• Fix for unknown Puppet subcommand 'master' (#28040)
• Fix undefined method server_version in downstream (#29577)
• Fix correct method_name in feature dynflow_sidekiq (#29556)
• Hide disk performance check (#29654)
• No spinner on non-tty output (#28281)
• Maintain foreman.service as part of foreman-maintain (#29246)
• Do not run installer for f-m install/update (#29511)
• Make upgrade executable via REX (#29645)
• EPEL check before package install preparation step (#29002)
• Reword the EPEL check description (#29617, #29560)