update changelog 

Merge pull request #269 from sbillinge/colors feat: use bg-mpl-stylesheets colors in plots

Merge pull request #266 from Tieqiong/readme doc: update readme install instructions

Merge pull request #266 from Tieqiong/readme doc: update readme install instructions

Fix plotting warnings in Pytest, add news for removal of six support (#……215) * Add news and fix warnings * Add back original file content

news (#196) 

try version fix (#191) 

first cut at cleaning manifest (#182) 

use download for document files (#180) 

use download for document files (#180)