Improve SPF Advice (Recommendation) for SoftFail

[weyCC81]

Request

/api/v1/scan/[rexx-hr.com]
https://dss.globalcyberalliance.org/api/v1/scan/[domain]

Reply

"spf": "v=spf1 include:_spf.rexx-suite.com ~all"

...

"spf": [
  "SPF seems to be setup correctly! No further action needed."
]

Additional

I would expect a recommendation in the following direction:

"SPF seems to be setup correctly, but it's recommended that you change from SoftFail to HardFail"

[wolveix]

Hey @weyCC81, thanks for the suggestion. Per our previous discussion, this is still tied up with #22.