docs(devServer): fix Travis CI

Simek · Simek · commit 7761f40c1fdc · 2018-03-13T12:14:18.000+01:00
diff --git a/src/content/configuration/dev-server.md b/src/content/configuration/dev-server.md
@@ -458,6 +458,7 @@ When `open` is enabled, the dev server will open the browser.
 ```js
 open: true
 ```
+
 If no browser is provided (as shown above), your default browser will be used. To specify a different browser, just pass its name instead of boolean:
 
 ```js
