build: tryingt of fix windows build issue

scripts/grunt/options/exec.js

@@ -9,6 +9,6 @@ module.exports = function(config, grunt) {
   return {
     tslint: 'node ./node_modules/tslint/lib/tslint-cli.js -c tslint.json --project ./tsconfig.json',
     jest: 'node ./node_modules/jest-cli/bin/jest.js ' + coverage,
-    webpack: './node_modules/.bin/webpack --config scripts/webpack/webpack.prod.js',
+    webpack: 'node ./node_modules/webpack/bin/webpack.js --config scripts/webpack/webpack.prod.js',
   };
 };