Update twemoji to v2.2.5

[peterwilsoncc]

Update Twemoji fallback in core to version 2.2.5 (released Feb) from version 2.2.2.

Diff
​https://github.com/twitter/twemoji/compare/v2.2.2...v2.2.5

This update replaces a number of images, a CDN update will be required [cc: @ocean90].

[peterwilsoncc]

I've created ​meta#2814 as a sister ticket.

[peterwilsoncc]

In 40615.diff​:

• Replace CDN url with 2.2.5
• Add second Emoji 4 test to include emoji added since 2.2.5
• ​Travis CI results

@pento Could you please do a quick review of the new emoji 4 test?

[pento]

I'd be inclined to put shrug first, then technologist - it seems like shrug is more likely to fail, so let's not run two tests where one will often do.

Apart from that, lgtm.

[peterwilsoncc]

In 40626:

Emoji: Update Twemoji to version 2.2.5

Updates Twemoji and adds a second Emoji 4 test to include a shrugging man. Emoji 4 is being implemented gradually, while some browsers now support the female technologist, the indifferent shrugging man is breaking things with his presence.

Props peterwilsoncc, pento for code review.
Fixes #40615.

[superpoincare]

Twemoji 2.3.0 is out. Might need new tests as well for emoji 5. Not sure whether to open a new ticket so notifying participants here.

[peterwilsoncc]

Replying to superpoincare:

Twemoji 2.3.0 is out. Might need new tests as well for emoji 5. Not sure whether to open a new ticket so notifying participants here.

Thanks for letting us know, I've created a seperate ticket.