fix: add new compat entry for JLD2 at 0.4

Author: ymtoo

Project.toml

@@ -20,6 +20,7 @@ ToeplitzMatrices = "c751599d-da0a-543b-9d20-d0a503d91d24"
 Distributions = "0.21, 0.22, 0.23, 0.24, 0.25"
 FileIO = "1"
 Interpolations = "0.12, 0.13, 0.14"
+JLD2 = "0.4"
 SpecialFunctions = "0.8, 0.9, 0.10, 1.0, 2"
 StaticArrays = "0.12, 1.1"
 StatsBase = "0.32, 0.33, 0.34"