Added mockkStatic support for val Any.xxx get()

[gmazzo]

We have found another use case for mockkStatic. Basically it's syntax sugar for when you try to mock an extension property like this:

val Int.square get()= this * this

[Raibaz]

Nice, thanks a lot for sending this through!

Just a favor to ask: can you please add a mention to this in the documentation?

It's just a matter of adding it in README.md, around line 800 in the section about mocking extension functions should be ok.

[gmazzo]

Updated!

[Raibaz]

Thanks a lot!