Fix test for enum keys as auto lowercase was disabled

mehcode · mehcode · commit b188f936854c · 2019-12-07T18:22:33.000-08:00
diff --git a/tests/get.rs b/tests/get.rs
@@ -230,6 +230,7 @@ fn test_enum() {
 #[test]
 fn test_enum_key() {
     #[derive(Debug, Deserialize, PartialEq, Eq, Hash)]
+    #[serde(rename_all = "lowercase")]
     enum Quark {
         Up,
         Down,
