Update README.md

Author: austencollins

README.md

@@ -122,10 +122,7 @@ Once you've chosen your configuration, run `serverless deploy` again (or simply
 
 ### Dev Mode
 
-<p align="center">
-  <img src="https://s3.amazonaws.com/assets.github.serverless/components/serverless_express_cli_dev_mode.gif" height="400" align="center">
-</p>
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+<img src="/assets/dev-demo.gif" height="250" align="right">
 
 Now that you've got your basic express app up and running, it's time to develop that into a real world application. Instead of having to run `serverless deploy` everytime you make changes you wanna test, run `serverless dev`, which allows the CLI to watch for changes in your source directory as you develop, and deploy instantly on save.