Enable version flag and version status check

**Is your feature request related to a problem? Please describe.**
It would be nice to show the current version when running `renfe-cli --version/-v` and check if running on latest version.

**Describe the solution you'd like**
Enable the version flag and prompt the check of version.

**Describe alternatives you've considered**
None

**Additional context**
Inspiration from `rodalies-cli`
