Update README.md (a typo)

Develop

* 'develop' of https://github.com/LaraDock/starter:
  add app url to the config and set it to laravel.dev

add the Docker-Machine mapping step

add a commented out `extra_hosts` to be uncommented incase of the usage
of `docker-machine` for mapping the `laravel.dev` url to the VM IP
inside the VM container.

Add minimum required version of Docker-Compose

- rename mysql data image to data,
- make the data hold redis data
- mount redis log file
- force redis to restart always
- add latest tags to all images
- add maintainer name