View the fully-resolved SPF tree for a given domain.

Optionally, only view the domains, or only IP addresses.
# Usage
```
spfr 0.0.3
Recursively look up the SPF record chain for a domain

USAGE:
    spfr [FLAGS] [OPTIONS] <domain>

FLAGS:
    -d, --domains-only    Only print domains, not the final, resolved IPs. Only honored when using text output format
    -h, --help            Prints help information
    -i, --ips-only        Only print IP addresses, not the domains. Only honored when using text output format
    -V, --version         Prints version information
    -v, --verbose         How verbose logs should be. Defaults to WARN; pass multiple times to increase verbosity

OPTIONS:
    -f, --format <format>              Specify an output format [default: text]
        --indentation <indentation>    Number of spaces to use for indentation, per level [default: 4]

ARGS:
    <domain>    The domain to do a recursive lookup on
```