added changelog for 0.6.0

added forgotten file

updated tox and travis to test py3.7

Added tag 0.5.0rc1 for changeset 0256c55518f0

sync project files with bioutils; use travis stages for test+deploy

added 0.4.1 changelog

imported patch docs-0.4

Fix for #150 (#151)

Closes #150

closes #149: fix bug in which multi-line abstracts were truncated

closes #140: migrate tests to vcrpy (and delete test data)