Remove docker update

travis-build.sh

@@ -1,11 +1,6 @@
 #!/bin/bash
 set -e
 
-docker version
-uname -a
-echo "Updating Docker engine to have multi-stage builds"
-sudo service docker stop
-curl -fsSL https://get.docker.com/ | sudo sh
 docker version
 
 if [ -d tmp ]; then