Bump version to 18.05.0-dev
Bump version to 18.05.0-dev

Docker 18.04.0 branch was cut from e6e47d95b5e3c54592ef7cef6dedbec6687e66d8

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

thaJeztah/cli,cpuguy83/cli,thaJeztah/cli,docker/cli,docker/cli,cpuguy83/cli