v0.6.0

Added

• manifold projects delete can delete projects, provided they contain
  no resources
• Refactor loading of different API clients into api package
• delete supports project flag
• sso command for getting resource single sign-on link
• build for high sierra in brew
• projects add and projects remove event
• services providers to list providers
• services products to list products
• services plans to list plans

Fixed

• project add fails when there is no project
• project remove should not list resources without project
• colors breaking alignment of tabwriter