Upgrade mypy to version 0.4.5.
Upgrade mypy to version 0.4.5.

Now that 0.4.5 is out, we no longer need to use a forked version of mypy.

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