chore: Add README entry

Author: route

CHANGELOG.md

@@ -10,6 +10,7 @@
 - `Browser::Client#command` accepts :async parameter [#433]
 - `Ferrum::Browser` introduce `:flatten` mode with one connection and sessions [#434]
 - Support for ping requests [#417]
+- `Ferrum::Browser` introduce `:ws_url` option to set external websocket for a browser [#435]
 
 ### Changed
 - `Ferrum::Page#screeshot` accepts :area option [#410]

README.md

@@ -187,6 +187,8 @@ Ferrum::Browser.new(options)
   * `:host` (String) - Remote debugging address for headless Chrome.
   * `:url` (String) - URL for a running instance of Chrome. If this is set, a
       browser process will not be spawned.
+  * `:ws_url` (String) - Websocket url for a running instance of Chrome. If this is set, a
+      browser process will not be spawned.
   * `:process_timeout` (Integer) - How long to wait for the Chrome process to
       respond on startup.
   * `:ws_max_receive_size` (Integer) - How big messages to accept from Chrome