Update BuildToolsVersion to 2.0.0-prerelease-02012-02
Update BuildToolsVersion to 2.0.0-prerelease-02012-02

Needed for https://github.com/dotnet/buildtools/commit/fcddc57cac0738e4ad0de79a3b094664a56d39fc

ptoonen/corefx,axelheer/corefx,ericstj/corefx,ericstj/corefx,ptoonen/corefx,BrennanConroy/corefx,twsouthwick/corefx,shimingsg/corefx,shimingsg/corefx,wtgodbe/corefx,tijoytom/corefx,Jiayili1/corefx,shimingsg/corefx,ravimeda/corefx,zhenlan/corefx,parjong/corefx,axelheer/corefx,wtgodbe/corefx,ravimeda/corefx,mmitche/corefx,parjong/corefx,ViktorHofer/corefx,Ermiar/corefx,ptoonen/corefx,wtgodbe/corefx,wtgodbe/corefx,Jiayili1/corefx,mmitche/corefx,seanshpark/corefx,shimingsg/corefx,parjong/corefx,Jiayili1/corefx,zhenlan/corefx,ericstj/corefx,ravimeda/corefx,tijoytom/corefx,wtgodbe/corefx,twsouthwick/corefx,ericstj/corefx,fgreinacher/corefx,ravimeda/corefx,zhenlan/corefx,ViktorHofer/corefx,ViktorHofer/corefx,seanshpark/corefx,Jiayili1/corefx,shimingsg/corefx,Ermiar/corefx,ViktorHofer/corefx,shimingsg/corefx,parjong/corefx,parjong/corefx,mmitche/corefx,mmitche/corefx,tijoytom/corefx,mmitche/corefx,ptoonen/corefx,seanshpark/corefx,seanshpark/corefx,twsouthwick/corefx,ViktorHofer/corefx,axelheer/corefx,tijoytom/corefx,twsouthwick/corefx,axelheer/corefx,ptoonen/corefx,ericstj/corefx,ravimeda/corefx,shimingsg/corefx,Ermiar/corefx,tijoytom/corefx,tijoytom/corefx,parjong/corefx,ptoonen/corefx,wtgodbe/corefx,ptoonen/corefx,ericstj/corefx,Jiayili1/corefx,Ermiar/corefx,fgreinacher/corefx,ericstj/corefx,mmitche/corefx,tijoytom/corefx,axelheer/corefx,seanshpark/corefx,Ermiar/corefx,Jiayili1/corefx,ravimeda/corefx,twsouthwick/corefx,axelheer/corefx,fgreinacher/corefx,BrennanConroy/corefx,Jiayili1/corefx,zhenlan/corefx,twsouthwick/corefx,Ermiar/corefx,Ermiar/corefx,parjong/corefx,wtgodbe/corefx,fgreinacher/corefx,mmitche/corefx,seanshpark/corefx,ViktorHofer/corefx,zhenlan/corefx,twsouthwick/corefx,BrennanConroy/corefx,zhenlan/corefx,zhenlan/corefx,ViktorHofer/corefx,ravimeda/corefx,seanshpark/corefx