Update README

Change-Id: Ib168013a2f0c486530d8db57b8669e2ca1541968
Reviewed-on: https://pirx.atteo.com/gerrit/352
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
Update parent to 1.5

Change-Id: I85e84495e720c6fc9a526c90e7bbca6f079a54d7