Merge branch 'master' into st/svm_example

Author: st--

test/Project.toml

@@ -24,7 +24,7 @@ Documenter = "0.25, 0.26, 0.27"
 FiniteDifferences = "0.10.8, 0.11, 0.12"
 ForwardDiff = "0.10"
 Functors = "0.2"
-Kronecker = "0.4"
+Kronecker = "0.4, 0.5"
 LogExpFunctions = "0.2, 0.3"
 PDMats = "0.9, 0.10, 0.11"
 ReverseDiff = "1.2"