Update the ReadMe

Author: mdmintz

README.md

@@ -4,7 +4,7 @@
 
 ✅ Everything you need to automate Web/UI testing.
 
-<img src="https://cdn2.hubspot.net/hubfs/100006/sb_demo_mode.gif" title="SeleniumBase" height="236"><br />
+<img src="https://cdn2.hubspot.net/hubfs/100006/images/new_demo_gif.gif" title="SeleniumBase" height="236"><br />
 (<i>Above: [my_first_test.py](https://github.com/seleniumbase/SeleniumBase/blob/master/examples/my_first_test.py) from [examples/](https://github.com/seleniumbase/SeleniumBase/tree/master/examples) running in demo mode, which adds JavaScript for highlighting page actions.</i>)<br />
 ```
 pytest my_first_test.py --demo_mode