jomo dff58c66e7 drop support for usernames
Mojang has disabled their legacy skins API:
https://twitter.com/MojangSupport/status/964511258601865216

With their API rate limits, it's now practially impossible
for us to support usernames.

Fixes #142. The default parameter allows using:

- UUID
- URL
- MHF_Alex
- MHF_Steve
- Alex
- Steve

Contrary to UUIDs, using alex/steve doesn't redirect
and instead provides the skin from a locally stored file.
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