I've not tested this, however, in theory you should be able to add the update by pulling directly from the repo. Here is the best way to achieve this (again, in theory).
As your sudo user run the following commands
REMEMBER: It's important to back things up.
You could do a
cp -a ~/SABnzbd ~/SABnzbd.COPY to preserve the original... just in case
mkdir -p ~/tmp/sab
git clone https://github.com/sabnzbd/sabnzbd.git ~/tmp/sab
mv -f ~/tmp/sab/.git ~/SABnzbd/.git
mv -f ~/tmp/sab/.gitignore ~/SABnzbd/.gitignore
rm -rf ~/tmp/sab
Once you have pulled the .git directory from the repo and moved these directories/files accordingly, you can then navigate to ~/SABnzbd and type
git pull to run a fresh pull of the current 1.1.1 branch.