Removed -y option for add-apt-repository

The -y flag on add-apt-repository breaks the bash script with the following message:

Usage: add-apt-repository sourceline

add-apt-repository is a script for adding apt sources.list entries. 
It can be used to add any repository and also provides a shorthand 
synatax for Launchpad PPA (Personal Package Archive) repositories via
ppa:user/repository


add-apt-repository: error: no such option: -y