Bump xcode version in travis config
Bump xcode version in travis config

yoichitgy/Swinject,yoichitgy/Swinject,Swinject/Swinject,yoichitgy/Swinject,yoichitgy/Swinject,Swinject/Swinject,Swinject/Swinject,Swinject/Swinject