julia> Pkg.add("TradingInstrument")
ERROR: The following packages are incompatible with fixed requirements: TradingInstrument
in _resolve at pkg.jl:182
in _resolve at no file
in anonymous at no file:31
in cd at file.jl:25
in cd at pkg/dir.jl:28
in edit at pkg.jl:21
in add at pkg.jl:18