add option to force update guid

[mh-cbon]

go-msi set-guid --help
NAME:
   go-msi set-guid - Sets appropriate guids in your wix manifest

USAGE:
   go-msi set-guid [command options] [arguments...]

OPTIONS:
   --path value, -p value  Path to the wix manifest file (default: "wix.json")

I should be able to do go-msi set-guid --force to force update, currently i have,

$ go-msi set-guid
The manifest was not updated
The file is saved on disk
go-msi set-guid --force
Incorrect Usage: flag provided but not defined: -force