update electron to squelch vuln warning

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.5.1",
+  "version": "0.6.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1360,20 +1360,20 @@
       "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
     },
     "electron": {
-      "version": "1.7.10",
-      "resolved": "https://registry.npmjs.org/electron/-/electron-1.7.10.tgz",
-      "integrity": "sha1-Oj6D2WX9f6/kc76N349HJWG2JT0=",
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-1.8.2.tgz",
+      "integrity": "sha512-0TV5Hy92g8ACnPn+PVol6a/2uk+khzmRtWxhah/FcKs6StCytm5hD14QqOdZxEdJN8HljXIVCayN/wJX+0wDiQ==",
       "dev": true,
       "requires": {
-        "@types/node": "7.0.52",
+        "@types/node": "8.9.3",
         "electron-download": "3.3.0",
         "extract-zip": "1.6.6"
       },
       "dependencies": {
         "@types/node": {
-          "version": "7.0.52",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-7.0.52.tgz",
-          "integrity": "sha512-jjpyQsKGsOF/wUElNjfPULk+d8PKvJOIXk3IUeBYYmNCy5dMWfrI+JiixYNw8ppKOlcRwWTXFl0B+i5oGrf95Q==",
+          "version": "8.9.3",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-8.9.3.tgz",
+          "integrity": "sha512-wqrPE4Uvj2fmL0E5JFQiY7D/5bAKvVUfWTnQ5NEV35ULkAU0j3QuqIi9Qyrytz8M5hsrh8Kijt+FsdLQaZR+IA==",
           "dev": true
         }
       }
@@ -4261,7 +4261,7 @@
         "debug": "2.6.9",
         "deep-defaults": "1.0.4",
         "defaults": "1.0.3",
-        "electron": "1.7.10",
+        "electron": "1.8.2",
         "enqueue": "1.0.2",
         "function-source": "0.1.0",
         "jsesc": "0.5.0",

package.json

@@ -44,6 +44,7 @@
     "@types/mkdirp": "^0.5.2",
     "@types/rimraf": "^2.0.2",
     "css-loader": "^0.28.7",
+    "electron": "^1.8.2",
     "eslint": "^4.13.1",
     "eslint-plugin-import": "^2.8.0",
     "get-port": "^3.2.0",