-m help text contains double spaces imported from curl's man page

[korya]

Problem

-m, --max-time int   Maximum  time  in seconds that you allow each request to take (default 20)
                            ^^     ^^

The double spaces are an artifact of copying from curl's man page, where they are troff formatting.

Suggested fix

cmd.PersistentFlags().IntP("max-time", "m", 20,
    "Maximum time in seconds that you allow each request to take")

Trivial, but it is the first thing a user sees in --help.