Remove promise-polyfill dependency

package.json

@@ -54,5 +54,5 @@
     "desktop": "assets/screenshot-desktop.jpg",
     "mobile": "assets/screenshot-mobile.jpg"
   },
-  "version": "0.5.5"
+  "version": "0.5.6"
 }

src/package-lock.json

@@ -10634,11 +10634,6 @@
       "integrity": "sha1-mEcocL8igTL8vdhoEputEsPAKeM=",
       "dev": true
     },
-    "promise-polyfill": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-8.1.0.tgz",
-      "integrity": "sha512-OzSf6gcCUQ01byV4BgwyUCswlaQQ6gzXc23aLQWhicvfX9kfsUiUhgt3CCQej8jDnl8/PhGF31JdHX2/MzF3WA=="
-    },
     "proto-list": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/proto-list/-/proto-list-1.2.4.tgz",

src/package.json

@@ -39,7 +39,6 @@
     "jquery": "^3.3.1",
     "lozad": "^1.14.0",
     "medium-zoom": "^1.0.3",
-    "promise-polyfill": "8.1.0",
     "slick-carousel": "^1.8.1",
     "stickybits": "^3.6.1",
     "tippy.js": "^4.0.1"