Add missing compat entries

Author: FriesischScott

Project.toml

@@ -34,7 +34,9 @@ DynamicPolynomials = "0.5"
 FastGaussQuadrature = "0.4, 0.5, 1"
 FiniteDifferences = "0.12"
 Formatting = "0.4"
+KernelDensity = "0.6"
 Mustache = "1.0"
 QuasiMonteCarlo = "0.3"
 Reexport = "0.2, 1.0"
+StatsBase = "0.33"
 julia = "1.6, 1.7, 1.8"