Fixed Python runtime according to the official Heroku doc
Fixed Python runtime according to the official Heroku doc

See https://devcenter.heroku.com/articles/python-runtimes#supported-runtimes
resmio/heroku-buildpack-geodjango,benmurden/heroku-buildpack-python-ember,marcospy/hackathon-globo-app,kvarga/heroku-buildpack-python,marcospy/hackathon-globo-app,gaumire/heroku-buildpack-python,wbrefvem/heroku-buildpack-python,doda/heroku-buildpack-python,cloudfoundry/python-buildpack,driftyco/heroku-buildpack-sphinx,arnfred/heroku-buildpack-python-hdf5-blas-lapack,ephemerallabs/heroku-buildpack-python,sjtuadamyang/adamyang-buildpack-python-libjpeg,kowito/python-buildpack,DylanLukes/heroku-buildpack-python,samuelhavron/heroku-buildpack-python,tukutela/heroku-buildpack-python,pkumar-appd/python-buildpack,pkumar-appd/python-buildpack,icoxfog417/heroku-buildpack-python,guidowb/buildpack-python,arnfred/heroku-buildpack-python-hdf5-blas-lapack,cloudfoundry/python-buildpack,uniphil/heroku-buildpack-pythonsass,Apogaea/heroku-buildpack-python,brianthomas/heroku-buildpack-textmining,maxcountryman/heroku-buildpack-python,WonderThink/heroku-buildpack-python-ffmpeg-geoip,jamarparris/heroku-buildpack-python-swig,arnfred/heroku-buildpack-python-hdf5-blas-lapack,edmorley/heroku-buildpack-python,tommyvn/heroku-buildpack-python,jvenezia/heroku-buildpack-python,Gliimpse/heroku-buildpack-SWIG-python,maciejgryka/heroku-buildpack-spcedge,ywarezk/heroku-buildpack-geodjango,heroku/heroku-buildpack-python,andrespires/python-buildpack,samuelhavron/heroku-buildpack-python,Brogency/heroku-buildpack-python-gulp,Scalingo/python-buildpack,Scalingo/python-buildpack,integricho/heroku-buildpack-python-ffmpeg2.1-with-codecs,liyanchang/cloudfoundary-buildbot-buildpack,Mause/heroku-buildpack-python,dubsmash/heroku-buildpack-python,slorg1/heroku-buildpack-python,nicktimko/heroku-buildpack-scipy,scrapinghub/scrapinghub-buildpack-scrapy,ryanhiebert/heroku-buildpack-python,joshisa/python-buildpack,manufacturedba/heroku-buildpack-python,AltSchool/heroku-buildpack-python,alexflanagan/operand-buildpack-python,RobertSundling/heroku-buildpack-python-nginx,ad-m/heroku-buildpack-python,marcospy/heroku-buildpack-scipy,18F/python-buildpack,ianyh/heroku-buildpack-python-bower,zakdoek/heroku-buildpack-django,gitricko/apt-python-buildpack,plangrid/heroku-buildpack-python,tukutela/heroku-buildpack-python,mobify/heroku-buildpack-python-swig,18F/python-buildpack,amanjain/heroku-buildpack-python-with-django-bower,gitricko/apt-python-buildpack,apiaryio/heroku-buildpack-python-scons,heroku/heroku-buildpack-python,ruscoder/heroku-buildpack-python,adamroth/heroku-buildpack-python-pdftk,thenovices/heroku-buildpack-scipy,igroff/heroku-buildpack-python,skilljar/heroku-buildpack-python,pmclanahan/heroku-buildpack-python-peep,oberlin/heroku-buildpack-python,hsr-ba-fs15-dat/heroku-buildpack,YoApp/heroku-buildpack-python-twemproxy,joshfriend/heroku-buildpack-python,film42/heroku-buildpack-python-wkhtmltopdf,nadirizr/heroku-buildpack-python-gulp,marianzange/heroku-buildpack-python,uniphil/heroku-buildpack-pythonsass,Stibbons/heroku-buildpack-python-installer,rapilabs/heroku-buildpack-python,bobsilverberg/heroku-buildpack-python-peep,liyanchang/buildbot-master-buildpack,buildbot/buildbot-master-buildpack,nikita-pivovarov/heroku-buildpack-python-ldap,wbrefvem/heroku-buildpack-python,martingascon/heroku-buildpack-python,andrespires/python-buildpack,cortexintel/heroku-buildpack-scipy,alexflanagan/operand-buildpack-python,cdht/heroku-buildpack-python,film42/heroku-buildpack-python-wkhtmltopdf,monological/heroku-buildpack-python-opencv,benjaminfox/heroku-buildpack-python-geoip,kowito/python-buildpack,jimlindeman/python-buildpack-collectd,loanzen/heroku-buildpack-python,benjaminfox/heroku-buildpack-python-geoip,liyanchang/cloudfoundary-buildbot-buildpack,18F/python-buildpack,junyoed/heroku-buildpack-python,pebble/cloudpebble-buildpack,samuelhavron/heroku-buildpack-python,miraculixx/heroku-buildpack-python,ianyh/heroku-buildpack-python-opencv,andela-brotich/wger-buildpack-python,gitricko/apt-python-buildpack,guidowb/buildpack-python,grivescorbett/heroku-buildpack-python,PerceptumNL/heroku-buildpack-python,jimlindeman/python-buildpack-collectd,rbtying/heroku-buildpack-python,river-jade/heroku-buildpack-scipy,Nazanin84/python-buildpack,Nazanin84/python-buildpack,arnaudlimbourg/heroku-buildpack-python,markine/heroku-buildpack-python,brightforme/heroku-buildpack-python,apiaryio/heroku-buildpack-python-scons,joshisa/python-buildpack,film42/heroku-buildpack-python-wkhtmltopdf,xica/heroku-buildpack-scipy,dvreed/heroku-buildpack-python-ldap,pkumar-appd/python-buildpack,samuelhavron/heroku-buildpack-python,marcospy/hackathon-globo-app,ekkleesia2/heroku-buildpack-python,swils/heroku-buildpack-python,blazekadam/open2,ianyh/heroku-buildpack-python-opencv,dulaccc/heroku-buildpack-geodjango,stalnacke/heroku-buildpack-python,samuelhavron/heroku-buildpack-python,swanson/heroku-buildpack-python-ortools,guidowb/buildpack-python,pwdel1/heroku-buildpack-scipy,mythmon/heroku-buildpack-python-nodejs,apiaryio/heroku-buildpack-python-scons,TipWander/heroku-buildpack-geodjango,andrespires/python-buildpack,vlidholt/heroku-buildpack-scipy,projetoeureka/heroku-buildpack-scipy,joshisa/python-buildpack,ad-m/heroku-buildpack-python,joshowen/heroku-buildpack-python,doda/heroku-buildpack-python,nemesiscodex/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,nwkotto/geodjango-buildpack-with-geos,Gliimpse/heroku-buildpack-SWIG-python,HanSooloo/heroku-buildpack-python,liyanchang/cloudfoundary-buildbot-buildpack,Gliimpse/heroku-buildpack-SWIG-python,samuelhavron/heroku-buildpack-python,edenspiekermann-amsterdam/heroku-buildpack-python,zakdoek/heroku-buildpack-django,uniphil/heroku-buildpack-pythonsass,beni55/heroku-buildpack-python,AltSchool/heroku-buildpack-python,samuelhavron/heroku-buildpack-python,soapril/heroku-buildpack-python,ianyh/heroku-buildpack-python-opencv,cloudfoundry/python-buildpack,Tiger66639/buildbot-master-buildpack,jimlindeman/python-buildpack-collectd,Nazanin84/python-buildpack,HousekeepLtd/heroku-buildpack-python,papaeye/heroku-buildpack-python-bower,ojacobson/heroku-buildpack-python,lukaszkorecki/heroku-buildpack-python,smalleats/heroku-buildpack-python,rollokb/heroku-buildpack-python,kowito/python-buildpack,cclauss/heroku-buildpack-python,agriffis/heroku-buildpack-python,predata/heroku-buildpack-scipy,samuelhavron/heroku-buildpack-python