Remove check on older version

abelsiqueira · dpo · commit 5aedfa1effff · 2018-06-12T11:40:14.000-07:00
diff --git a/src/kron.jl b/src/kron.jl
@@ -1,9 +1,5 @@
 import Base.kron
 
-@static if VERSION < v"0.5.0-"
-  issymetric(A) = issym(A)
-end
-
 # (A ⊗ B)×vec(X) = vec(BXAᵀ)
 """`kron(A, B)`
 
