Updated README to remove mkisofs requirement

Author: fabiorauber

README.md

@@ -14,20 +14,6 @@ The installation steps are:
 4. Extract the archive
 5. Move the driver binary to your PATH, so it can be found by docker-machine.
 
-# Requirements
-
-To use a generic configdrive, mkisofs is required to create the ISO drive. To install it:
-
-MacOS:
-```
-brew install cdrtools
-```
-
-Linux (Ubuntu):
-```
-apt-get install genisoimage
-```
-
 # Installation from source
 Following the installation of Golang and Docker Machine, you can install the
 docker-machine-xcp-driver: