DragonFlyBSD

I have corrected a typo in the DPorts readme. I couldn't figure out how the
readme is generated, so I submit a patch for the readme itself in hopes that
someone else will figure out where it should go.

A patch is attached, and I have also committed the change to a git repository.
The following changes since commit 324fc331180e99cc306e28d32a4d5c802c3b14ed:

correct a typo (2016-01-06 20:24:28 +0000)

are available in the git repository at:

git@github.com:tlevine/DPorts.git typo

for you to fetch changes up to 324fc331180e99cc306e28d32a4d5c802c3b14ed:

correct a typo (2016-01-06 20:24:28 +0000)