Updated the list of supported Python versions.

Author: devlinbd2

sample-apps/blank-python/README.md

@@ -11,7 +11,7 @@ The project source includes function code and supporting resources:
 Use the following instructions to deploy the sample application.
 
 # Requirements
-- [Python 3.7](https://www.python.org/downloads/)
+- [Python 3.7](https://www.python.org/downloads/). Sample also works with Python 3.8 and 3.9. 
 - The Bash shell. For Linux and macOS, this is included by default. In Windows 10, you can install the [Windows Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10) to get a Windows-integrated version of Ubuntu and Bash.
 - [The AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html) v1.17 or newer.