Add a -v switch to display version of sfctl

[sridmad]

or -h switch includes version information.

Helps with analyzing and reporting issues

[samedder]

Will consider it. As a workaround another option is to use pip: pip show sfctl

[mani-ramaswamy]

pip show sfctl gives me a blank. Since this is now GA, we should have the versioning show up. with a --version switch.

[samedder]

@mani-ramaswamy do you have pip or pip3? Try pip3 show sfctl.

[Christina-Kang]

PR #104 adds this functionality. Use sfctl -v or sfctl --version for output on sfctl version, python version, OS, and python location.