[README] Add tzdata to dependencies for Ubuntu
[README] Add tzdata to dependencies for Ubuntu

Fixes https://bugs.swift.org/browse/SR-4921

natecook1000/swift,parkera/swift,practicalswift/swift,hooman/swift,parkera/swift,austinzheng/swift,ahoppen/swift,shajrawi/swift,jopamer/swift,tjw/swift,jopamer/swift,felix91gr/swift,glessard/swift,OscarSwanros/swift,danielmartin/swift,stephentyrone/swift,tkremenek/swift,milseman/swift,shahmishal/swift,jmgc/swift,roambotics/swift,xedin/swift,swiftix/swift,nathawes/swift,zisko/swift,alblue/swift,felix91gr/swift,frootloops/swift,benlangmuir/swift,amraboelela/swift,benlangmuir/swift,aschwaighofer/swift,danielmartin/swift,atrick/swift,brentdax/swift,natecook1000/swift,devincoughlin/swift,aschwaighofer/swift,atrick/swift,JGiola/swift,jopamer/swift,shajrawi/swift,calebd/swift,shahmishal/swift,harlanhaskins/swift,allevato/swift,OscarSwanros/swift,karwa/swift,lorentey/swift,hooman/swift,xwu/swift,lorentey/swift,airspeedswift/swift,djwbrown/swift,xedin/swift,huonw/swift,airspeedswift/swift,nathawes/swift,sschiau/swift,JGiola/swift,airspeedswift/swift,uasys/swift,gribozavr/swift,devincoughlin/swift,deyton/swift,apple/swift,gribozavr/swift,milseman/swift,harlanhaskins/swift,austinzheng/swift,sschiau/swift,calebd/swift,stephentyrone/swift,frootloops/swift,practicalswift/swift,atrick/swift,OscarSwanros/swift,karwa/swift,aschwaighofer/swift,djwbrown/swift,allevato/swift,jckarter/swift,lorentey/swift,rudkx/swift,jopamer/swift,austinzheng/swift,hooman/swift,tjw/swift,tjw/swift,alblue/swift,shahmishal/swift,benlangmuir/swift,zisko/swift,glessard/swift,jckarter/swift,frootloops/swift,deyton/swift,shahmishal/swift,glessard/swift,huonw/swift,rudkx/swift,djwbrown/swift,deyton/swift,jmgc/swift,milseman/swift,hughbe/swift,xedin/swift,tkremenek/swift,hooman/swift,xedin/swift,glessard/swift,gribozavr/swift,brentdax/swift,swiftix/swift,shajrawi/swift,huonw/swift,OscarSwanros/swift,huonw/swift,hughbe/swift,uasys/swift,alblue/swift,ahoppen/swift,allevato/swift,JGiola/swift,harlanhaskins/swift,rudkx/swift,deyton/swift,sschiau/swift,apple/swift,airspeedswift/swift,brentdax/swift,tjw/swift,frootloops/swift,shahmishal/swift,calebd/swift,frootloops/swift,parkera/swift,aschwaighofer/swift,apple/swift,djwbrown/swift,devincoughlin/swift,rudkx/swift,stephentyrone/swift,zisko/swift,stephentyrone/swift,practicalswift/swift,hughbe/swift,gribozavr/swift,airspeedswift/swift,lorentey/swift,deyton/swift,brentdax/swift,return/swift,parkera/swift,djwbrown/swift,alblue/swift,benlangmuir/swift,roambotics/swift,tkremenek/swift,felix91gr/swift,apple/swift,benlangmuir/swift,austinzheng/swift,natecook1000/swift,ahoppen/swift,nathawes/swift,karwa/swift,parkera/swift,allevato/swift,jmgc/swift,swiftix/swift,roambotics/swift,devincoughlin/swift,return/swift,aschwaighofer/swift,rudkx/swift,roambotics/swift,hughbe/swift,uasys/swift,xwu/swift,practicalswift/swift,lorentey/swift,return/swift,swiftix/swift,JGiola/swift,austinzheng/swift,benlangmuir/swift,hooman/swift,tjw/swift,practicalswift/swift,deyton/swift,stephentyrone/swift,shahmishal/swift,xwu/swift,practicalswift/swift,uasys/swift,alblue/swift,shajrawi/swift,harlanhaskins/swift,xedin/swift,parkera/swift,jmgc/swift,jckarter/swift,CodaFi/swift,huonw/swift,ahoppen/swift,jmgc/swift,jopamer/swift,shahmishal/swift,alblue/swift,hughbe/swift,calebd/swift,CodaFi/swift,natecook1000/swift,felix91gr/swift,uasys/swift,danielmartin/swift,milseman/swift,airspeedswift/swift,jopamer/swift,swiftix/swift,return/swift,calebd/swift,JGiola/swift,calebd/swift,gregomni/swift,parkera/swift,xedin/swift,natecook1000/swift,gregomni/swift,amraboelela/swift,ahoppen/swift,austinzheng/swift,frootloops/swift,shajrawi/swift,atrick/swift,jmgc/swift,CodaFi/swift,aschwaighofer/swift,gribozavr/swift,hughbe/swift,milseman/swift,djwbrown/swift,lorentey/swift,allevato/swift,tkremenek/swift,gregomni/swift,nathawes/swift,harlanhaskins/swift,OscarSwanros/swift,tjw/swift,felix91gr/swift,stephentyrone/swift,shajrawi/swift,rudkx/swift,atrick/swift,milseman/swift,brentdax/swift,CodaFi/swift,nathawes/swift,sschiau/swift,xwu/swift,roambotics/swift,austinzheng/swift,parkera/swift,tjw/swift,return/swift,amraboelela/swift,amraboelela/swift,glessard/swift,xwu/swift,glessard/swift,roambotics/swift,gribozavr/swift,gregomni/swift,frootloops/swift,jckarter/swift,deyton/swift,zisko/swift,allevato/swift,practicalswift/swift,milseman/swift,amraboelela/swift,nathawes/swift,sschiau/swift,amraboelela/swift,natecook1000/swift,sschiau/swift,danielmartin/swift,karwa/swift,amraboelela/swift,apple/swift,devincoughlin/swift,zisko/swift,devincoughlin/swift,lorentey/swift,aschwaighofer/swift,karwa/swift,sschiau/swift,CodaFi/swift,uasys/swift,sschiau/swift,gribozavr/swift,nathawes/swift,apple/swift,gregomni/swift,uasys/swift,devincoughlin/swift,djwbrown/swift,jmgc/swift,JGiola/swift,hooman/swift,ahoppen/swift,jckarter/swift,brentdax/swift,xwu/swift,calebd/swift,CodaFi/swift,return/swift,hughbe/swift,return/swift,alblue/swift,karwa/swift,xedin/swift,stephentyrone/swift,tkremenek/swift,jopamer/swift,karwa/swift,tkremenek/swift,zisko/swift,practicalswift/swift,shahmishal/swift,swiftix/swift,gribozavr/swift,xwu/swift,jckarter/swift,danielmartin/swift,CodaFi/swift,danielmartin/swift,gregomni/swift,lorentey/swift,zisko/swift,felix91gr/swift,huonw/swift,OscarSwanros/swift,hooman/swift,swiftix/swift,brentdax/swift,natecook1000/swift,OscarSwanros/swift,atrick/swift,jckarter/swift,xedin/swift,danielmartin/swift,karwa/swift,felix91gr/swift,devincoughlin/swift,shajrawi/swift,harlanhaskins/swift,harlanhaskins/swift,tkremenek/swift,huonw/swift,airspeedswift/swift,allevato/swift,shajrawi/swift