Add supported Django versions classifiers
Add supported Django versions classifiers

mistalaba/djangocms-blog,skirsdeda/djangocms-blog,marty3d/djangocms-blog,britny/djangocms-blog,vnavascues/djangocms-blog,ImaginaryLandscape/djangocms-blog,skirsdeda/djangocms-blog,motleytech/djangocms-blog,EnglishConnection/djangocms-blog,skirsdeda/djangocms-blog,nephila/djangocms-blog,jedie/djangocms-blog,vnavascues/djangocms-blog,marty3d/djangocms-blog,dapeng0802/djangocms-blog,nephila/djangocms-blog,kriwil/djangocms-blog,mistalaba/djangocms-blog,EnglishConnection/djangocms-blog,ImaginaryLandscape/djangocms-blog,britny/djangocms-blog,kriwil/djangocms-blog,jedie/djangocms-blog,sephii/djangocms-blog,dapeng0802/djangocms-blog,motleytech/djangocms-blog,sephii/djangocms-blog,nephila/djangocms-blog