disq-0.3.4

This is a minor release which primarily includes internal code cleanup.

Complete Change List:

22c5c92 Remove index merging code from src/htsjdk #68 (#121)
202e1f0 Fix calls to deprecated htsjdk APIs (#117)
65cfd22 add tests for SAM files that corrupt with adam + htsjdk 0.20.x (#120)
8dd2362 Warn on unrecognized options (fixes #25) (#118)
8cfd528 Drop oraclejdk8 on travis since it is no longer supported, and we already have openjdk8 to test Java 8 (#119)