release tox 2.9.1 

release tox 2.9.0 

fix up changelog title - we need to tweak towncrier a bit 

tox-dev#466 stop env var leakage if popen failed with resultjson or r… …edirect

update changelog 

cut 2.8.0 release 

merge changes from master 

Merge pull request tox-dev#574 from Avira/master fix up tox-dev#521: add missing pass of arg to underlying function.

Show default text for missing descriptions in `-[l|a]v` 

release 2.6.0