add stability_lfc to menu

Author: ufechner7

examples/menu.jl

@@ -7,6 +7,7 @@ options = ["test_winchcontroller = include(\"test_winchcontroller.jl\")",
            "test_tuned_winchcontroller = include(\"test_tuned_winchcontroller.jl\")",
            "plot_power = include(\"plot_power.jl\")",
            "stability_ufc = include(\"stability_ufc.jl\")",
+           "stability_lfc = include(\"stability_lfc.jl\")",
            "help = WinchControllers.help()",
            "quit"]