Syntax error in MFRC522.py causing a massive slowdown 

In MFRC522.py on line 199 the code is 
`if ~((i!=0) and ~(n&0x01) and ~(n&waitIRq)):`
It should use `not` instead of `~` since at the moment the entire loop only exits when done 2000 times, which takes 1.6 seconds 
replacing the `~`'s with `not`'s creates a massive speed up. 
So the line should be 
`if not ((i != 0) and not (n & 0x01) and not (n & waitIRq)):`