added Plots to constants.jl
added Plots to constants.jl
JuliaCI/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl,JuliaCI/PackageEvaluator.jl,IainNZ/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl,IainNZ/PackageEvaluator.jl,JuliaCI/PackageEvaluator.jl,IainNZ/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl