update sumOfCoins
update
Merge branch 'master' of https://github.com/AndreyNikolaev/CoffeeMachineIOS-2nd-edition

Conflicts:

CoffeeMachine.xcodeproj/project.xcworkspace/xcuserdata/dancho.xcuserdata
d/UserInterfaceState.xcuserstate

CoffeeMachine.xcodeproj/xcuserdata/dancho.xcuserdatad/xcdebugger/Breakpo
ints.xcbkptlist