add LinMPC to docs env

Author: baggepinnen

docs/Project.toml

@@ -3,6 +3,7 @@ ControlSystemsBase = "aaaaaaaa-a6ca-5380-bf3e-84a91bcd477e"
 DisplayAs = "0b91fe84-8a4c-11e9-3e1d-67c38462b6d6"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
+LinearMPC = "82e1c212-e1a2-49d2-b26a-a31d6968e3bd"
 MonteCarloMeasurements = "0987c9cc-fe09-11e8-30f0-b96dd679fdca"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 RobustAndOptimalControl = "21fd56a4-db03-40ee-82ee-a87907bee541"

ext/RobustAndOptimalControlLinearMPCExt.jl

@@ -8,6 +8,7 @@ module RobustAndOptimalControlLinearMPCExt
 using LinearMPC
 using LinearAlgebra
 using RobustAndOptimalControl: LQGProblem
+using ControlSystemsBase: isdiscrete
 
 
 """
@@ -58,7 +59,7 @@ function LinearMPC.MPC(prob::LQGProblem;
     kwargs...
 )
     # Validate discrete-time system
-    if !ControlSystemsBase.isdiscrete(prob)
+    if !isdiscrete(prob)
         error("Only discrete-time systems are supported. Got a continuous-time system.")
     end