This release introduces a new skin API we've built in-house SkinsRestorer/mojang-api. We've had to make our own API, as the Ashcon API has started to return unreliable results and caused many issues with our users. This new API is still new and we do not know how much traffic we'll see. This API is new and we may change behavior in the future.
We've also dropped support for Sponge.

Changes
04b5233 This commit marks release 15.0.11
ec55068 Improve javadoc
d11776d More cleanup
a943ba0 Replace ashcon with eclipse
ffdb46d Drop all support for Sponge
4b2d8c9 Bump to snapshot