zerver/lib/session_user.py: Replace Dict by Mapping.
zerver/lib/session_user.py: Replace Dict by Mapping.

PhilSk/zulip,SmartPeople/zulip,rishig/zulip,jainayush975/zulip,krtkmj/zulip,verma-varsha/zulip,aakash-cr7/zulip,KingxBanana/zulip,hackerkid/zulip,PhilSk/zulip,TigorC/zulip,dattatreya303/zulip,showell/zulip,eeshangarg/zulip,sharmaeklavya2/zulip,synicalsyntax/zulip,AZtheAsian/zulip,amyliu345/zulip,ahmadassaf/zulip,eeshangarg/zulip,susansls/zulip,krtkmj/zulip,vabs22/zulip,AZtheAsian/zulip,krtkmj/zulip,Diptanshu8/zulip,kou/zulip,christi3k/zulip,arpith/zulip,eeshangarg/zulip,zacps/zulip,dhcrzf/zulip,Galexrt/zulip,synicalsyntax/zulip,brainwane/zulip,jainayush975/zulip,zacps/zulip,mohsenSy/zulip,tommyip/zulip,Galexrt/zulip,christi3k/zulip,TigorC/zulip,rishig/zulip,joyhchen/zulip,kou/zulip,reyha/zulip,krtkmj/zulip,vabs22/zulip,zulip/zulip,jainayush975/zulip,dhcrzf/zulip,mohsenSy/zulip,vikas-parashar/zulip,punchagan/zulip,hackerkid/zulip,rishig/zulip,dattatreya303/zulip,zacps/zulip,timabbott/zulip,TigorC/zulip,blaze225/zulip,synicalsyntax/zulip,Juanvulcano/zulip,jackrzhang/zulip,synicalsyntax/zulip,j831/zulip,shubhamdhama/zulip,jphilipsen05/zulip,j831/zulip,paxapy/zulip,samatdav/zulip,jainayush975/zulip,Diptanshu8/zulip,cosmicAsymmetry/zulip,isht3/zulip,vabs22/zulip,Diptanshu8/zulip,vaidap/zulip,amyliu345/zulip,jrowan/zulip,vikas-parashar/zulip,paxapy/zulip,sonali0901/zulip,mahim97/zulip,KingxBanana/zulip,dawran6/zulip,Jianchun1/zulip,brockwhittaker/zulip,ryanbackman/zulip,dattatreya303/zulip,christi3k/zulip,jackrzhang/zulip,Juanvulcano/zulip,calvinleenyc/zulip,brockwhittaker/zulip,tommyip/zulip,verma-varsha/zulip,dawran6/zulip,jrowan/zulip,eeshangarg/zulip,grave-w-grave/zulip,kou/zulip,mahim97/zulip,amanharitsh123/zulip,vaidap/zulip,jackrzhang/zulip,aakash-cr7/zulip,ahmadassaf/zulip,SmartPeople/zulip,zulip/zulip,timabbott/zulip,arpith/zulip,KingxBanana/zulip,umkay/zulip,ahmadassaf/zulip,grave-w-grave/zulip,AZtheAsian/zulip,jainayush975/zulip,shubhamdhama/zulip,zulip/zulip,dawran6/zulip,Juanvulcano/zulip,sup95/zulip,cosmicAsymmetry/zulip,punchagan/zulip,dhcrzf/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,krtkmj/zulip,reyha/zulip,paxapy/zulip,mahim97/zulip,amyliu345/zulip,Diptanshu8/zulip,umkay/zulip,hackerkid/zulip,souravbadami/zulip,shubhamdhama/zulip,Juanvulcano/zulip,vaidap/zulip,calvinleenyc/zulip,jackrzhang/zulip,TigorC/zulip,Jianchun1/zulip,zulip/zulip,verma-varsha/zulip,JPJPJPOPOP/zulip,rht/zulip,eeshangarg/zulip,Galexrt/zulip,brainwane/zulip,peguin40/zulip,peguin40/zulip,synicalsyntax/zulip,calvinleenyc/zulip,grave-w-grave/zulip,amanharitsh123/zulip,j831/zulip,zulip/zulip,ahmadassaf/zulip,aakash-cr7/zulip,christi3k/zulip,cosmicAsymmetry/zulip,timabbott/zulip,KingxBanana/zulip,AZtheAsian/zulip,rht/zulip,showell/zulip,rht/zulip,rishig/zulip,grave-w-grave/zulip,AZtheAsian/zulip,shubhamdhama/zulip,brainwane/zulip,andersk/zulip,samatdav/zulip,sup95/zulip,jackrzhang/zulip,andersk/zulip,dawran6/zulip,jrowan/zulip,KingxBanana/zulip,jrowan/zulip,sharmaeklavya2/zulip,Jianchun1/zulip,joyhchen/zulip,umkay/zulip,andersk/zulip,aakash-cr7/zulip,showell/zulip,joyhchen/zulip,souravbadami/zulip,mohsenSy/zulip,arpith/zulip,kou/zulip,brainwane/zulip,verma-varsha/zulip,ahmadassaf/zulip,aakash-cr7/zulip,vaidap/zulip,kou/zulip,sharmaeklavya2/zulip,blaze225/zulip,sup95/zulip,mohsenSy/zulip,dawran6/zulip,Jianchun1/zulip,j831/zulip,peguin40/zulip,christi3k/zulip,punchagan/zulip,brainwane/zulip,niftynei/zulip,hackerkid/zulip,peguin40/zulip,susansls/zulip,dhcrzf/zulip,jphilipsen05/zulip,blaze225/zulip,mahim97/zulip,tommyip/zulip,shubhamdhama/zulip,zulip/zulip,j831/zulip,arpith/zulip,rht/zulip,rht/zulip,rht/zulip,JPJPJPOPOP/zulip,blaze225/zulip,punchagan/zulip,calvinleenyc/zulip,punchagan/zulip,brockwhittaker/zulip,dattatreya303/zulip,mahim97/zulip,brockwhittaker/zulip,krtkmj/zulip,shubhamdhama/zulip,showell/zulip,vabs22/zulip,samatdav/zulip,joyhchen/zulip,isht3/zulip,niftynei/zulip,aakash-cr7/zulip,andersk/zulip,SmartPeople/zulip,cosmicAsymmetry/zulip,vikas-parashar/zulip,verma-varsha/zulip,amyliu345/zulip,brockwhittaker/zulip,jrowan/zulip,ryanbackman/zulip,reyha/zulip,grave-w-grave/zulip,vaidap/zulip,susansls/zulip,grave-w-grave/zulip,samatdav/zulip,timabbott/zulip,souravbadami/zulip,Juanvulcano/zulip,peguin40/zulip,joyhchen/zulip,jphilipsen05/zulip,dhcrzf/zulip,joyhchen/zulip,niftynei/zulip,jphilipsen05/zulip,vabs22/zulip,isht3/zulip,souravbadami/zulip,sup95/zulip,samatdav/zulip,zacps/zulip,Juanvulcano/zulip,vikas-parashar/zulip,jrowan/zulip,umkay/zulip,jphilipsen05/zulip,hackerkid/zulip,tommyip/zulip,rht/zulip,mahim97/zulip,calvinleenyc/zulip,SmartPeople/zulip,sharmaeklavya2/zulip,Diptanshu8/zulip,Galexrt/zulip,SmartPeople/zulip,synicalsyntax/zulip,kou/zulip,TigorC/zulip,tommyip/zulip,umkay/zulip,souravbadami/zulip,showell/zulip,zacps/zulip,j831/zulip,blaze225/zulip,JPJPJPOPOP/zulip,andersk/zulip,reyha/zulip,susansls/zulip,brockwhittaker/zulip,sonali0901/zulip,krtkmj/zulip,andersk/zulip,isht3/zulip,Diptanshu8/zulip,timabbott/zulip,dawran6/zulip,rishig/zulip,jackrzhang/zulip,reyha/zulip,shubhamdhama/zulip,amanharitsh123/zulip,mohsenSy/zulip,ahmadassaf/zulip,vikas-parashar/zulip,sup95/zulip,showell/zulip,christi3k/zulip,amanharitsh123/zulip,PhilSk/zulip,tommyip/zulip,PhilSk/zulip,sonali0901/zulip,umkay/zulip,punchagan/zulip,arpith/zulip,hackerkid/zulip,timabbott/zulip,hackerkid/zulip,jackrzhang/zulip,sup95/zulip,niftynei/zulip,timabbott/zulip,punchagan/zulip,Jianchun1/zulip,TigorC/zulip,susansls/zulip,dattatreya303/zulip,souravbadami/zulip,jainayush975/zulip,rishig/zulip,AZtheAsian/zulip,JPJPJPOPOP/zulip,isht3/zulip,vikas-parashar/zulip,Galexrt/zulip,paxapy/zulip,sonali0901/zulip,amanharitsh123/zulip,eeshangarg/zulip,sonali0901/zulip,verma-varsha/zulip,ryanbackman/zulip,ryanbackman/zulip,ahmadassaf/zulip,vabs22/zulip,mohsenSy/zulip,susansls/zulip,samatdav/zulip,arpith/zulip,dhcrzf/zulip,kou/zulip,calvinleenyc/zulip,zacps/zulip,ryanbackman/zulip,SmartPeople/zulip,ryanbackman/zulip,synicalsyntax/zulip,andersk/zulip,niftynei/zulip,cosmicAsymmetry/zulip,peguin40/zulip,sonali0901/zulip,tommyip/zulip,eeshangarg/zulip,sharmaeklavya2/zulip,reyha/zulip,amanharitsh123/zulip,brainwane/zulip,amyliu345/zulip,brainwane/zulip,isht3/zulip,jphilipsen05/zulip,zulip/zulip,vaidap/zulip,JPJPJPOPOP/zulip,Galexrt/zulip,dattatreya303/zulip,KingxBanana/zulip,sharmaeklavya2/zulip,PhilSk/zulip,showell/zulip,paxapy/zulip,blaze225/zulip,niftynei/zulip,Jianchun1/zulip,amyliu345/zulip,paxapy/zulip,umkay/zulip,PhilSk/zulip,Galexrt/zulip,rishig/zulip,cosmicAsymmetry/zulip