Update the emoji library

[ckhatton]

Could someone update the emoji library? I have created a PR #127.

MacOS users

If a release is never made from this pull request, you can just copy the package.json and package-lock.json files into the app. You can do this be first making sure the app is closed (cmd+q when the emoji selector is open) and then right-clicking on the app icon in Applications and then selecting "Show Package Contents", then root to Contents > Resources > app. Replace the two files there.