Release 1.2.6

update changelog

Fix import error in unrar/rarvm, v1.2.4

Update docs for gunzip

Tweak README for 1.2.2 release

Update changelog for 1.2.1 release

Updated readme and changelog for 1.2.0 release

Update changelog for 1.1.7 release

Update to 1.1.6 for mp3 streams and ffprobe reporting mp4 files with …

…unknown levels

1.1.5: Add support for HE-AAC profile in mp4a.