Remove misplaced line in README

Hi there!

Was originally going to fix the "Tweeets" typo on this line, but I realized that this entire line might be out-of-place.

I was going to move it, but looks like this is already covered at the top of the README anyway ("The top left hand corner allows users to subscribe to notifications on service UP and DOWN via EMAIL and SMS"), so I think removing it makes sense.

Cheers!