feat: use scoped package @deckdeckgo/qrcode

Author: peterpeterparker

docs/package-lock.json

@@ -18,8 +18,8 @@
     "@deckdeckgo/core": "^1.0.0-beta.34",
     "@deckdeckgo/highlight-code": "^1.0.0-alpha.15",
     "@deckdeckgo/inline-editor": "^1.0.0-alpha.7",
+    "@deckdeckgo/qrcode": "^1.0.0-alpha.7",
     "@ionic/core": "4.2.0",
-    "deckdeckgo-qrcode": "^1.0.0-alpha.6",
     "rxjs": "^6.4.0"
   },
   "devDependencies": {