added missing proc-macro invocation to migration guide (#2209)

alex · web-flow · commit 01d8f1e6965c · 2022-03-05T15:46:36.000Z
diff --git a/guide/src/migration.md b/guide/src/migration.md
@@ -51,6 +51,7 @@ use pyo3::types::PyString;
 #[pyclass]
 struct MyClass { }
 
+#[pymethods]
 impl MyClass {
     fn __str__(&self) -> &'static [u8] {
         b"hello, world"
