Add instruction to update git submodules
Add instruction to update git submodules

and formatted command line commands.

tjarratt/Xcode-Better-Refactor-Tools,tjarratt/Xcode-Better-Refactor-Tools,tjarratt/Xcode-Better-Refactor-Tools,tjarratt/Xcode-Magic-And-Shit,tjarratt/fake4swift,tjarratt/Xcode-Better-Refactor-Tools,tjarratt/Xcode-Magic-And-Shit,tjarratt/fake4swift,tjarratt/Xcode-Better-Refactor-Tools,tjarratt/fake4swift,tjarratt/Xcode-Magic-And-Shit,tjarratt/Xcode-Magic-And-Shit,tjarratt/Xcode-Magic-And-Shit,tjarratt/Xcode-Better-Refactor-Tools