v2.15.2 / 2020 Aug 31

[com.taoensso/nippy "2.15.2"]

This is a quick hotfix release, should be non-breaking.

Only change since v2.15.0 is to bump Encore dependency (v2.124.0->v2.126.2).

Encore v1.123.0 introduced an issue affecting Timbre.
Issue was addressed with Encore v2.125.2.

Updating Encore here doesn't affect Nippy, but may be helpful for users of
Nippy that also use Timbre and that haven't otherwise updated to a newer
version of Encore yet.