Pin celery at <3.0 to fix #538.
Pin celery at <3.0 to fix #538.

Kryz/sentry,gencer/sentry,chayapan/django-sentry,looker/sentry,mvaled/sentry,alexm92/sentry,alex/sentry,beeftornado/sentry,llonchj/sentry,boneyao/sentry,daevaorn/sentry,wujuguang/sentry,jokey2k/sentry,argonemyth/sentry,beni55/sentry,NickPresta/sentry,pauloschilling/sentry,korealerts1/sentry,zenefits/sentry,beeftornado/sentry,felixbuenemann/sentry,wong2/sentry,boneyao/sentry,BuildingLink/sentry,songyi199111/sentry,JackDanger/sentry,felixbuenemann/sentry,JTCunning/sentry,fuziontech/sentry,daevaorn/sentry,fotinakis/sentry,JamesMura/sentry,kevinlondon/sentry,SilentCircle/sentry,gencer/sentry,NickPresta/sentry,SilentCircle/sentry,Natim/sentry,SilentCircle/sentry,ifduyue/sentry,drcapulet/sentry,Natim/sentry,ngonzalvez/sentry,1tush/sentry,drcapulet/sentry,gg7/sentry,wong2/sentry,looker/sentry,ifduyue/sentry,boneyao/sentry,mvaled/sentry,felixbuenemann/sentry,kevinlondon/sentry,pauloschilling/sentry,ngonzalvez/sentry,fotinakis/sentry,1tush/sentry,chayapan/django-sentry,wujuguang/sentry,nicholasserra/sentry,looker/sentry,jean/sentry,TedaLIEz/sentry,jean/sentry,nicholasserra/sentry,alexm92/sentry,zenefits/sentry,mvaled/sentry,mitsuhiko/sentry,JTCunning/sentry,imankulov/sentry,jean/sentry,jokey2k/sentry,jokey2k/sentry,songyi199111/sentry,JTCunning/sentry,BuildingLink/sentry,daevaorn/sentry,argonemyth/sentry,camilonova/sentry,kevinastone/sentry,pauloschilling/sentry,BayanGroup/sentry,Natim/sentry,kevinlondon/sentry,ifduyue/sentry,wong2/sentry,NickPresta/sentry,llonchj/sentry,vperron/sentry,ifduyue/sentry,ewdurbin/sentry,ngonzalvez/sentry,gencer/sentry,NickPresta/sentry,JamesMura/sentry,fuziontech/sentry,nicholasserra/sentry,zenefits/sentry,chayapan/django-sentry,looker/sentry,mvaled/sentry,argonemyth/sentry,beni55/sentry,jean/sentry,drcapulet/sentry,JamesMura/sentry,alexm92/sentry,korealerts1/sentry,ewdurbin/sentry,BayanGroup/sentry,mitsuhiko/sentry,beni55/sentry,TedaLIEz/sentry,rdio/sentry,kevinastone/sentry,hongliang5623/sentry,looker/sentry,BayanGroup/sentry,rdio/sentry,camilonova/sentry,mvaled/sentry,fotinakis/sentry,camilonova/sentry,wujuguang/sentry,JackDanger/sentry,jean/sentry,gencer/sentry,vperron/sentry,gencer/sentry,BuildingLink/sentry,ifduyue/sentry,mvaled/sentry,zenefits/sentry,TedaLIEz/sentry,JamesMura/sentry,JamesMura/sentry,BuildingLink/sentry,songyi199111/sentry,rdio/sentry,vperron/sentry,ewdurbin/sentry,Kryz/sentry,BuildingLink/sentry,fuziontech/sentry,rdio/sentry,imankulov/sentry,gg7/sentry,fotinakis/sentry,korealerts1/sentry,daevaorn/sentry,hongliang5623/sentry,llonchj/sentry,gg7/sentry,JackDanger/sentry,hongliang5623/sentry,imankulov/sentry,kevinastone/sentry,Kryz/sentry,beeftornado/sentry,SilentCircle/sentry,alex/sentry,alex/sentry,zenefits/sentry,1tush/sentry