font-meslo-for-powerline: Update to latest version

[segevfiner]

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In the following questions <cask> is the token of the cask you're submitting.

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[bevanjkay]

This should be pinned to a release of some sort, rather than just tracking master.

[segevfiner]

No release was made in ages, other casks from this repo seem to point to latest...

[SMillerDev]

Since there is a repo, can you ask for a release?

[segevfiner]

I asked powerline/fonts#402, but I'm not sure it is likely to happen and the rest of the fonts from that repo point to master as well.

[p-linnane]

Agreed that this does not seem likely. Closing.