Documentation enhancement

[mbierman]

The documentation is unclear.

How to get Json output?
ipinfo -j myip doesn't work.

How to get one field?
ipinfo -f City myip doesn't work.

[UmanShahzad]

@mbierman The flags need to come after the subcommand, which is documented in the usage string:

$ ipinfo
# notice the optional <opts> coming after <cmd>
Usage: ipinfo <cmd> [<opts>] [<args>]

...

So it'd be ipinfo myip -j.

For the field, it should be lowercase to match the JSON output, so it'd be ipinfo myip -f city. I can add a feature to force lowercase it but that might break in case we have a field that has some uppercase letters, like exampleField.

[mbierman]

I think it is fine to leave the capitalization as it is. That seems like what I would expect.

It would be great if you could beef up the documentation a little to explain the flags and subcommands though.

[UmanShahzad]

#13 is meant to help with that indeed.