v1.8.0

• 267ff8e feat: Update fetch mixin to support region input (#1328)
• f1c1176 feat: pfe-icon now supports setting default icon sets
• 56eb55e fix: pfe-accordion IE11 regression; background context should always be white with black text
• 398003e fix: [pfe-icon] Update icon color vs. background color custom property support
• 63df897 fix: Add in missing polyfills for pfelement