Julia 为图例添加颜色会使条形图全部为正值

生成以下绘图：

（snd条应为负数）

是否有解决此问题的方法

致以最良好的祝愿

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Sebastian

此问题已通过拉取请求修复：

using Gadfly, DataFrames

v = DataFrame(x = [1,2,3], y = [0.5,-0.7,1.2], label = ["a","b","c"])

plot(v , x=:x, y=:y, Geom.bar, Theme(bar_spacing = 2mm), 
Guide.title("geneX"), Guide.ylabel("fold change"),
Guide.xlabel("technique"), color = :label)

#  without 'color = :label'
plot(v , x=:x, y=:y, Geom.bar, Theme(bar_spacing = 2mm),
Guide.title("geneX"), Guide.ylabel("fold change"), Guide.xlabel("technique"))