add API latest update timestamp

[warengonzaga]

🤔 Not Existing Feature Request?

• [X] Yes, I'm sure, this is a new requested feature!

🤔 Not an Idea or Suggestion?

• [X] Yes, I'm sure, this is not idea or suggestion!

📋 Request Details

@kquirapas and I, think of it to add like timestamp when is the last update of the API. Somewhere here. First of all, we need to update the API here I guess. https://github.com/web3phl/directory-api

📜 Code of Conduct

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[kquirapas]

@warengonzaga on it

[kquirapas]

API response JSON updated here: https://github.com/web3phl/directory-api/commit/0725705542db7ae1d78a1dab6065768cff378f22

[warengonzaga]

Merged #61