Dependencies update, including latest clojure 1.11.3

Fixes #69

target java 1.8

Bumps to Clojure 1.8

Includes version bump in readme

Fix: median returns nil for empty histograms

Java-side lint fixes (and warning suppression)

version 4.0.0

Fixes sum when the min value and the first bin's mean are the same

Nit fix

Version 2.0.1