forogot to update release tag. hence put 0.2.7.1

release v0.2.7

release v0.2.6

update dependency

update change log

fix long line

fix #27: use rownames to detect SheetStream

release 0.2.1

prepare for release v0.2.0, fix #22

remove duplicated information scattered around pyexcel and its compon…

…ents