Description of your changes

Changed all internal references to v1alpha1 to v1beta1 to make the function
work in my test setup where I use v1beta1 for mye stuff.

Not sure if this is the way to do it, and there might be a reason this is not already done...

Fixes #53

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit tests for my change.