Update .clang-format for YAML 1.2.
Update .clang-format for YAML 1.2.

YAML 1.2 seems to have removed some implicit typing rules, such
as treating Yes as true.

parkera/swift,xwu/swift,tkremenek/swift,parkera/swift,parkera/swift,roambotics/swift,glessard/swift,glessard/swift,JGiola/swift,benlangmuir/swift,hooman/swift,hooman/swift,JGiola/swift,xwu/swift,hooman/swift,JGiola/swift,hooman/swift,gregomni/swift,atrick/swift,rudkx/swift,rudkx/swift,parkera/swift,rudkx/swift,gregomni/swift,gregomni/swift,xwu/swift,atrick/swift,ahoppen/swift,parkera/swift,rudkx/swift,xwu/swift,benlangmuir/swift,benlangmuir/swift,benlangmuir/swift,hooman/swift,xwu/swift,parkera/swift,tkremenek/swift,JGiola/swift,parkera/swift,hooman/swift,apple/swift,apple/swift,tkremenek/swift,roambotics/swift,rudkx/swift,xwu/swift,atrick/swift,gregomni/swift,ahoppen/swift,apple/swift,xwu/swift,parkera/swift,atrick/swift,gregomni/swift,ahoppen/swift,tkremenek/swift,roambotics/swift,ahoppen/swift,ahoppen/swift,tkremenek/swift,apple/swift,JGiola/swift,glessard/swift,benlangmuir/swift,roambotics/swift,gregomni/swift,atrick/swift,rudkx/swift,apple/swift,apple/swift,glessard/swift,roambotics/swift,benlangmuir/swift,hooman/swift,tkremenek/swift,glessard/swift,JGiola/swift,tkremenek/swift,atrick/swift,roambotics/swift,ahoppen/swift,glessard/swift