• Added: automatic definition of traits for Active Record enum attributes, enabled by default
• Added: traits_for_enum method to define traits for non-Active Record enums
• Added: build_stubbed_starting_id= option to define the starting id for build_stubbed
• Removed: deprecated methods on the top-level FactoryBot module meant only for internal use
• Removed: support for EOL versions of Ruby (2.3, 2.4) and Rails (4.2)
• Removed: support for "abstract" factories with no associated class; use traits instead.