Set machine driver version to 0.13.0

The change no longer starting the VM after create is
non-backwards-compatible, that's a good opportunity to switch
to 0.13 for our versioning.

Author: cfergeau

pkg/hyperkit/constants.go

@@ -2,7 +2,7 @@ package hyperkit
 
 const (
 	DriverName    = "hyperkit"
-	DriverVersion = "0.12.14"
+	DriverVersion = "0.13.0"
 
 	DefaultMemory  = 8192
 	DefaultCPUs    = 4