Accessibility improvements for Select component

#309 Add button role to select trigger. This results in a few a11y improvements:

• Screen readers will better announce the menu button as actionable
• Screen reader focus is correctly returned back to the menu button -- Select was
  already returning focus to the menu button programatically, but
  because the menu button only had tabindex it wasn't seen by screen
  readers as an interactive element. Screen reader focus would be stuck
  on the selected menu item instead of being returned to the button.

Add typography

• Adds a Text component that implements the Snacks typography system 🎉

0.0.118

Fixes

• Add Switch component to exports #301
• Add focus styles to new Switch component #300

0.0.117

New Components

• Add Switch component #280

0.0.116

Enhancements

• Add onFocus and onBlur to Checkbox and Radio components

0.0.115

Fixes

• Replace isEqual with lodash.isequal #293

0.0.114

Enhancements

• New Parking and Walking icons #291

0.0.113

Enhancements

• Allow element attributes to be passed to NavigationPill's anchor child element #289

0.0.112

Enhancement

• Add refs to ScrollTrack's forward and back buttons #287 and #286

0.0.111

Improvements

Add the ability to add attributes to inner elements for NavigationPill and NavigationPills: #284