Update app icons for @3x screens

Author: mattrubin

Authenticator/Resources/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -3,20 +3,38 @@
     {
       "size" : "29x29",
       "idiom" : "iphone",
-      "filename" : "Icon-29@2x.png",
+      "filename" : "Icon-58.png",
       "scale" : "2x"
     },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-87.png",
+      "scale" : "3x"
+    },
     {
       "size" : "40x40",
       "idiom" : "iphone",
-      "filename" : "Icon-40@2x.png",
+      "filename" : "Icon-80.png",
       "scale" : "2x"
     },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-120.png",
+      "scale" : "3x"
+    },
     {
       "size" : "60x60",
       "idiom" : "iphone",
-      "filename" : "Icon-60@2x.png",
+      "filename" : "Icon-120.png",
       "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-180.png",
+      "scale" : "3x"
     }
   ],
   "info" : {