Description of changes:
For ease of readers, added a hyperlink in the readme file which will point to the lambda_backup.py file.
The reference is dynamic and path-based so it will also work across all forks.

Previously:

5)    For Lambda function code, paste the Lambda function from the [link] GitHub repository.

Now

5)    For Lambda function code, paste the [Lambda function](../master/lambda_backup.py) from the GitHub repository.