Add a note to UPGRADE

dunglas · dunglas · commit 63e94b40ddf1 · 2016-11-26T11:51:14.000+01:00
diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
@@ -111,6 +111,10 @@ Serializer
    deprecated and will not be supported in Symfony 4.0. You should use the
    `CacheClassMetadataFactory` class instead.
 
+ * The `AbstractObjectNormalizer::isAttributeToNormalize()` method has been removed
+   because it was initially added by mistake, has never been used and is not tested
+   nor documented.
+
 Translation
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