Prettify `carthage help` list a bit
Prettify `carthage help` list a bit

abbeycode/Carthage,erichoracek/Carthage,erichoracek/Carthage,erichoracek/Carthage,flovilmart/Carthage,flovilmart/Carthage,NachoSoto/Carthage,0xced/Carthage,erichoracek/Carthage,flovilmart/Carthage,abbeycode/Carthage,NachoSoto/Carthage,abbeycode/Carthage,0xced/Carthage,0xced/Carthage,abbeycode/Carthage,NachoSoto/Carthage