Update Project.toml

Plots 1 compat

Author: baggepinnen

Project.toml

@@ -2,7 +2,7 @@ name = "ControlSystems"
 uuid = "a6e380b2-a6ca-5380-bf3e-84a91bcd477e"
 authors = ["Dept. Automatic Control, Lund University"]
 repo = "https://github.com/JuliaControl/ControlSystems.jl.git"
-version = "0.5.8"
+version = "0.5.9"
 
 [deps]
 Colors = "5ae59095-9a9b-59fe-a467-6f913c188581"