Set NSAllowsArbitraryLoads to true

Might fix auto-update issue
(see electron-userland/electron-builder#3377)

package.json

@@ -11,6 +11,17 @@
   "homepage": "https://solarwallet.io/",
   "repository": "github:satoshipay/solar",
   "main": "./electron/lib/index.prod.js",
+  "mac": {
+    "type": "distribution",
+    "extendInfo": {
+      "NSAppTransportSecurity": {
+        "NSAllowsArbitraryLoads": true
+      }
+    },
+    "target": [
+      "zip"
+    ]
+  },
   "scripts": {
     "precommit": "lint-staged",
     "lint:fix": "tslint --fix '{src,stories}/**/*.{ts,tsx}'",