Heatmap, categorical axes, and aspect_ratio

Update time

using Plots
unicodeplots()

xs = [string("x", i) for i = 1:10]
ys = [string("y", i) for i = 1:4]
z = float((1:4) * reshape(1:10, 1, :))
heatmap(xs, ys, z, aspect_ratio = 1)

┌───────────┐ 40 5.31693 │▄▄▄▄▄▄▄▄▄▄▄│ ┌──┐ │▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│ -1.31693 │▄▄▄▄▄▄▄▄▄▄▄│ └──┘ └───────────┘ 1 0 10

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