sub:pull script

package.json

@@ -19,6 +19,7 @@
   "scripts": {
     "sub:init": "git submodule update --init --recursive",
     "sub:update": "git submodule update --remote",
+    "sub:pull": "git submodule foreach git pull origin master",
     "postinstall": "./node_modules/.bin/electron-rebuild && npm run sub:init",
     "lint": "tslint src/**/*.ts || true",
     "lint:fix": "tslint src/**/*.ts --fix",