Hi!

I think it would be super useful to have the negation of ShouldJSONEqual as ShouldNotJSONEqual.

I need to check if a JSON has changed from one step to the next one, and as it is now I can only check the Equality. I think is easy enough to implement, and it can be very useful (same as the other negations ShouldNotJSONContain or ShouldNotJSONContainWithKey).

Thanks in advance :)