Upgrade promis to v1.0.6.
Upgrade promis to v1.0.6.

kevinrodbe/fontfaceobserver,iksi/fontfaceobserver,matuzo/fontfaceobserver,ttamminen/fontfaceobserver,matuzo/fontfaceobserver,bramstein/fontfaceobserver,iksi/fontfaceobserver,bramstein/fontfaceobserver,kevinrodbe/fontfaceobserver,ttamminen/fontfaceobserver