Add -v option

Please add something like bashlight -v to show the current version.

[vergissberlin]

It should be good to follow recommendations for bash scripts for that function. Use templates like:

• https://argbash.io/send_template#generated
• http://linuxcommand.org/lc3_new_script.php
• https://github.com/wsaleme/bash-script-generator

[vergissberlin]

@MWU-NR this feature comes with the next release.