build: update scripts

Author: mrholek

package.json

@@ -17,7 +17,7 @@
   "homepage": "https://coreui.io",
   "author": "The CoreUI Team (https://github.com/orgs/coreui/people)",
   "scripts": {
-    "start": "npm-run-all watch docs-serve",
+    "start": "npm-run-all --parallel watch docs-serve",
     "bundlewatch": "bundlewatch --config .bundlewatch.config.json",
     "css": "npm-run-all css-compile css-prefix css-minify",
     "css-compile": "sass --style expanded --source-map --embed-sources --no-error-css scss/:dist/css/",