Fix typo

Fixes #171

router_test.go

diff --git a/router_test.go b/router_test.go
index 88895a3..fe58c8a 100644
--- a/router_test.go
+++ b/router_test.go
@@ -68,11 +68,11 @@
 }
 
 type handlerStruct struct {
-	handeled *bool
+	handled *bool
 }
 
 func (h handlerStruct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	*h.handeled = true
+	*h.handled = true
 }
 
 func TestRouterAPI(t *testing.T) {