How to make a gantt plot with Plots.jl

General Usage
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@rafael.guerra, I was hoping I could ask you a follow up question. How do I force all labels of the same type on to the same row. Here is a simple example:

using Plots, DataFrames

rect(w, h, x, y) = Shape(x .+ [0,w,w,0], y .+ [0,0,h,h])

df = DataFrame(label=["A","B","B"], start_time=[1.0,3.0,6.0], end_time=[4.0,5.0,8.0], color=[:blue,:green,:green])

df.duration = df.end_time - df.start_time

r = [rect(t[1],1,t[2],t[3]) for t in zip(df.duration, df.start_time, 1:nrow(df))]

plot(r, c=permutedims(df.color), yticks=(1.5:(nrow(df) + 0.5), df.label), xlabel="Time")

The problem is that two rows are created for B instead of 1. Any help would be greatly appreciated!