Update contributor-key.yml

[semseysandor]

Added my details in contributors.

Thanks, it's nice to be on this list :)

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[eileenmcnaughton]

Thanks!