update help output for --config flag

[kaumnen]

current help flag output:

Flags:
      --config string         Config file (default is $HOME/.cipr.yaml)
  -h, --help                  help for cipr
      --source string         Custom data source for ip ranges (url or path). Must have https:// for urls. (default "hosted")
  -v, --verbose               Enable verbose output (equivalent to --verbose-mode=full)
      --verbose-mode string   Verbosity level: none, mini, full. Overrides --verbose (default "none")
      --version               version for cipr

change description text. config default is $HOME/.config/cipr/cipr.toml