Skip pymethods hygiene on `multiple-pymethods`

tests/test_hygiene.rs

@@ -2,6 +2,8 @@ mod hygiene {
     mod misc;
     mod pyclass;
     mod pyfunction;
+    // cannot implement protos in #[pymethods] using `multiple-pymethods` feature
+    #[cfg(not(feature = "multiple-pymethods"))]
     mod pymethods;
     mod pymodule;
     mod pyproto;