install adm-zip

package-lock.json

@@ -199,6 +199,12 @@
         }
       }
     },
+    "adm-zip": {
+      "version": "0.4.7",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.7.tgz",
+      "integrity": "sha1-hgbCy/HEJs6MjsABdER/1Jtur8E=",
+      "dev": true
+    },
     "after": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",

package.json

@@ -19,6 +19,7 @@
   },
   "homepage": "https://github.com/ueokande/vim-vixen",
   "devDependencies": {
+    "adm-zip": "^0.4.7",
     "babel-cli": "^6.24.1",
     "babel-eslint": "^8.0.2",
     "babel-loader": "^7.1.1",