Merge pull request rails#12690 from durrantm/minor_README_change

Clarify that visiting http://localhost:3000 should be done in a browser. [ci skip]

Author: senny

README.md

@@ -59,7 +59,7 @@ independently outside Rails.
 
    Run with `--help` or `-h` for options.
 
-4. Go to http://localhost:3000 and you'll see: "Welcome aboard: You're riding Ruby on Rails!"
+4. Using a browser, go to http://localhost:3000 and you'll see: "Welcome aboard: You're riding Ruby on Rails!"
 
 5. Follow the guidelines to start developing your application. You may find
    the following resources handy: