RFR: Add thumbs up emoji alias

[Robin Westberg]

Hi all,

Please review this minor change that adds an entry for the 👍 emoji, which we've recently encountered in the wild.

Best regards,
Robin

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Commits:
 - c4bb48a4:	Add thumbs up emoji alias

Pull request:
https://git.openjdk.java.net/skara/pull/135

Webrev:
https://webrevs.openjdk.java.net/skara/135/webrev.00

Patch:
https://git.openjdk.java.net/skara/pull/135.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/135/head:pull/135