updated --config_key to --config-key for consistency

[paperpunk]

--config-file command line option uses a - dash in the name and --config_key option currently uses an _ underscore in the name. Updated to --config-key so that both options consistently use a dash in the name.

[calvn]

I would love to guard against potential breakage of other people's deployment by allowing both flags for the short term (perhaps a release or two). We could deprecate the old flag, and remove it once people are aware of the changes.

[paperpunk]

Sure, I added --config_key for backwards compatibility

[huffleman51]

Has this feature been released?

[breser]

Negative, you can view the documentation for the released versions by looking at the tag for that version.

[huffleman51]

@breser Thanks, that helps!