Request to add revocation feature for API key

[DonaldKellett]

It currently appears that OMDb users are unable to revoke old API keys and generate new ones, at least for the free account. IMO it would be useful to allow API key revocation and regeneration since mishaps involving leaked API keys do happen. Would this be doable while keeping track of API usage per email account (so free users cannot circumvent the daily limit by revoking and regenerating API keys)?