Support KEDA 2.0

[jeffhollan]

We'll be updating the KEDA Samples README to call out which samples only work with KEDA 1.0. It looks like you'd need changes to make this 2.0 compatible (in deployment), so creating issue here to call out. Here's a link to the migration guide for 2.0 https://keda.sh/docs/2.0/migration/

Thanks a ton for this sample regardless if you end up porting it to 2.0