FYI: PSA: how to quote code with backticks
This looks like PyPlot crashes Julia 1.0.1 on macOS Mojave · Issue #405 · JuliaPy/PyPlot.jl · GitHub. You can workaround the issue by using Qt5Agg backend:
https://github.com/JuliaPy/PyPlot.jl/issues/405#issuecomment-436134944
https://github.com/JuliaPy/PyPlot.jl/issues/399#issuecomment-430592493