Fixed not being to iterate over const collections.

tests/ListTests.cpp

@@ -45,5 +45,13 @@ TEST_CASE("Create List, insert values, iterate over values", "[Utilities]") {
     }
 }
 
+TEST_CASE("Create const List, iterate over values", "[Utilities]") {
+    const auto& ls = List<int>({10, 100, 50});
+
+    for (auto v: ls){
+        CHECK(ls.Contains(v));
+    }
+}
+
 
 #endif