Options test: Fix wrong variable name

router_test.go

diff --git a/router_test.go b/router_test.go
index 835caf0..9dc6296 100644
--- a/router_test.go
+++ b/router_test.go
@@ -123,7 +123,7 @@
 
 	r, _ = http.NewRequest("OPTIONS", "/GET", nil)
 	router.ServeHTTP(w, r)
-	if !head {
+	if !options {
 		t.Error("routing OPTIONS failed")
 	}