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.
Until now it was a big mess with some strings using single quotes and some others double quotes
We were using way more double quotes, so I chose to use them globally