update readme django wrapper
update readme django wrapper

BibMartin/python-nvd3,oz123/python-nvd3,Coxious/python-nvd3,BibMartin/python-nvd3,Coxious/python-nvd3,liang42hao/python-nvd3,liang42hao/python-nvd3,liang42hao/python-nvd3,oz123/python-nvd3,oz123/python-nvd3,Coxious/python-nvd3,BibMartin/python-nvd3