indentation issue on SimpleMFRC522.py

[JianDk]

I forked the project as I wanted to make an improvement on the read method in SimpleMFRC522.py. When I cloned my fork and opened SimpleMFRC522.py I found that indentation was 2 spaces. In Python we need 4 spaces indentation.

Strangely when I installed the package using pip install everything worked out fine.

[zachary822]

As long as it's consistent indentation, python will work. You can indent everything with 5 tabs if you wish.