update

package.json

@@ -14,6 +14,7 @@
     "@babel/preset-typescript": "^7.10.4",
     "@hot-loader/react-dom": "^16.13.0",
     "@types/html-webpack-plugin": "^3.2.3",
+    "@types/jszip": "^3.4.1",
     "@types/openpgp": "^4.4.12",
     "@types/react": "^16.9.46",
     "@types/react-dom": "^16.9.8",
@@ -39,6 +40,7 @@
     "webpack-subresource-integrity": "^1.4.1"
   },
   "dependencies": {
+    "jszip": "^3.5.0",
     "nanoid": "^3.1.12",
     "openpgp": "^4.10.7",
     "react": "^16.13.1",