Will this never end? Fixed typo resulting in PHP error

PHP sure is picky about those little parenthesis!!

For reals, though, I love using Pantheon because I don't have to
worry about pushing any changes that will royally screw up my
live site. Sure, I tried building out the dev/test/live workflow
on my own, and it would have worked reasonably well (albeit much
more slowly). But, using Pantheon makes it easy to get things up
and running, and makes it possible for me to get back to building
out my site sooner.

Thanks @pantheon-systems!

Signed-off-by: Elliot Voris <elliotfriend@gmail.com>