Replace dependency on opn.

package.json

@@ -60,14 +60,14 @@
     "less-loader": "^4.1.0",
     "loading-cli": "^1.0.6",
     "mini-css-extract-plugin": "^0.4.0",
+    "open-browsers": "^1.0.3",
     "optimize-css-assets-webpack-plugin": "^4.0.0",
     "postcss-flexbugs-fixes": "^3.2.0",
     "postcss-loader": "^2.0.9",
     "progress-bar-webpack-plugin": "^1.11.0",
     "raw-content-replace-loader": "^1.0.1",
     "raw-extend-loader": "^1.0.5",
     "raw-tree-replace-loader": "^1.1.0",
-    "rdoc-dev-utils": "^1.0.2",
     "react": "^16.3.2",
     "react-document-title": "^2.0.3",
     "react-dom": "^16.3.2",

src/server.js

@@ -1,6 +1,6 @@
 const webpack = require('webpack');
 const WebpackDevServer = require('webpack-dev-server');
-const opn = require('opn');
+const openBrowsers = require('openBrowser');
 const detect = require('detect-port');
 const conf = require('./conf/webpack.config.dev');
 const createDevServerConfig = require('./conf/webpack.config.server');
@@ -26,7 +26,7 @@ module.exports = function server(cmd) {
         return console.log(err); // eslint-disable-line
       }
       // open browser
-      opn(`http://${HOST}:${DEFAULT_PORT}`);
+      openBrowsers(`http://${HOST}:${DEFAULT_PORT}`);
     });
   }).catch((err) => {
     console.log(err); // eslint-disable-line