Update readme with correct skip script name

[victorhaggqvist]

Script should not be named block but blocked, according to the code.

[phillipberndt]

Thanks! But the error is in autorandr, not in the readme: The legacy version also names the script block, and I want to keep both versions as compatible as possible.

[victorhaggqvist]

Ah, I just assumed that the docs were old.
So rather like this then. Changed blocked to block in the code.

[phillipberndt]

Thanks again!