update changelog for 3.4.0 release

[danrosenthal]

3.4.0 - 2019-01-08

Enhancements

• Moved icons to a separate npm package (#686)
• Added oneHalf and oneThird props to Layout component (#724)
• Added helpText prop to ActionList items (#777)
• Updated Page header layout so actions take up less room on small screens (#707)
• Added alternateTool prop to ResourceList component (#812)
• Updated color of warning status ExceptionList items from dark orange to dark yellow for better differentiation from critical status items (#813)

Bug fixes

• Fixed TextField not showing the correct color while it has focus and an error (#806)
• Fixed ResourceList not rendering BulkActions on initial load when items were selected (#746)
• Fixed the new variant of the Badge component so that it is simpler and easier to read (#751)
• Reverted a change that set the autocomplete property on TextField to nope when it was false (#761)
• Added dismiss button for CalloutCard (#353)
• Removed an extra tab stop from ResourceList.Item and make it unactionable while loading (#745)
• Fixed Checkbox from losing focus when quickly toggled (#717)
• Fixed the console error in the PositionedOverlay test environment (#758)
• Fixed ResourceList not rendering a header after initial load (thanks to @andrewpye for the original issue)
• Fixed TextField not passing step to the input (#829)
• Renamed Option and Group types in Select to work around typedoc oddness (#830)

Documentation

• Modified image paths to fit the style guide’s new Markdown parsing rules (#753)

Development workflow

• Added a slight delay to the Percy screenshot script to give time for components to render fully (#704)
• Refactors to remove cyclical type imports (#759, #754, and #767)

Dependency upgrades

• Upgraded @shopify/polaris-tokens to v2.1.1 (#813)

Code quality

• Improve withAppProvider, withSticky, withRef, and withContext types to allow them to infer a component’s props (#805)

[danrosenthal]

https://github.com/Shopify/polaris-styleguide/pull/2488

[danrosenthal]

https://github.com/Shopify/web/pull/9544

[kaelig]

Just a couple of nitpicks, aside from that it looks good to me!

[danrosenthal]

Updated: https://github.com/Shopify/polaris-styleguide/pull/2494