DOC Update new features and add release date.
DOC Update new features and add release date.

YihaoLu/pyfolio,femtotrader/pyfolio,quantopian/pyfolio,ChinaQuants/pyfolio,quantopian/pyfolio,ChinaQuants/pyfolio,femtotrader/pyfolio,chayapan/pyfolio,YihaoLu/pyfolio