Add arturo to tests (exercism#1147)

Author: ErikSchierboom

workspace/test_configurations.go

@@ -65,6 +65,9 @@ var TestConfigurations = map[string]TestConfiguration{
 		Command: "8th -f test.8th",
 	},
 	// abap: tests are run via "ABAP Development Tools", not the CLI
+	"arturo": {
+		Command: "arturo tester.art",
+	},
 	"awk": {
 		Command: "bats {{test_files}}",
 	},