Update README. A bit of cleanup in petrarch.py.
Update README. A bit of cleanup in petrarch.py.

johnb30/petrarch2,openeventdata/petrarch2,pjdufour/petrarch,openeventdata/petrarch,cnnorris/petrarch,opcoder/zh_ptr,johnb30/petrarch,JingL1014/petrarch2,Sayeedsalam/spec-petrarch2