chore(serve): use cli flags from dev server package

Author: knagaitsev

lib/utils/dev-server-flags.js

@@ -1,8 +1,8 @@
 import * as cmdArgs from "command-line-args";
+import { devServer } from "webpack-dev-server/bin/cli-flags";
 import * as WebpackCLI from "../../lib/webpack-cli";
 import * as startDevServer from "./startDevServer";
 import * as argsToCamelCase from "./args-to-camel-case";
-import { devServer } from "../../lib/utils/dev-server-flags";
 import { core } from "../../lib/utils/cli-flags";
 
 /**