subscribe.free.fr added

[amalgopal2015]

Overall Checklist

• I agree to the project's Developer Certificate of Origin
• The top-level JSON objects are sorted alphabetically
• There are no open pull requests for the same update

for password-rules.json

• The given rule isn't particularly standard and obvious for password managers
• Generated passwords have been tested from this rule using the Password Rules Validation Tool
• Information has been included about the website's requirements (eg. screenshots, error messages, steps during experimentation, etc.)
• The PR isn't documenting something that would be a common practice among password managers (e.g. minimal length of 6)

[amalgopal2015]

Suggestion for subscribe.free.fr

[amalgopal2015]

@rmondello can you please review this?

[kiddailey]

Verified that this looks good, works in/matches the password validation tool, and matches the provided screenshot.