v3.1.0

• Upgraded to Rails 5.2
• Upgraded to Ruby 2.5.4
• Composable content #309 #357 #358 - see wiki for various guides
• Custom simple_form wrappers #354
• Fixed koi path in app template #353
• Fixed crash when trying to render a nil date on index crud view 77f6c15
• Renamed generated assets route to koi_assets to fix issues with rails asset helpers like asset_path #360
• Fixed record count to be accurate for nested resources and for search results #361
• Fixed email fields not wrapping