add Printf to Project.toml

Author: baggepinnen

Project.toml

@@ -1,7 +1,7 @@
 name = "ControlSystems"
 uuid = "a6e380b2-a6ca-5380-bf3e-84a91bcd477e"
-repo = "https://github.com/JuliaControl/ControlSystems.jl.git"
 authors = ["Dept. Automatic Control, Lund University"]
+repo = "https://github.com/JuliaControl/ControlSystems.jl.git"
 version = "0.5.2"
 
 [deps]
@@ -13,6 +13,7 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 Polynomials = "f27b6e38-b328-58d1-80ce-0feddd5e7a45"
+Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"