[README] Update the Xcode version to beta 2
[README] Update the Xcode version to beta 2

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