Add upgrade information

symfony · alexpott · Aug 4, 2016 · Aug 4, 2016 · Aug 8, 2016 · Aug 8, 2016
commit 3894e6df3716378dfbecb11f06c33919ce735255
diff --git a/UPGRADE-3.2.md b/UPGRADE-3.2.md
@@ -70,3 +70,9 @@ Validator
        // ...
    }
    ```
+
+Yaml
+----
+
+ * Support for silently ignoring duplicate keys in YAML has been deprecated and
+   will lead to a `ParseException` in Symfony 4.0.
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
@@ -230,6 +230,10 @@ Yaml
  * The `!!php/object` tag to indicate dumped PHP objects was removed in favor of
    the `!php/object` tag.
 
+ * Support for silently ignoring duplicate keys in YAML has been deprecated and
+   will lead to a `ParseException` in Symfony 4.0.
+
+
 Validator
 ---------
-Original file line number
+Diff line change
@@ Expand Up / @@ -70,3 +70,9 @@ Validator @@
            // ...
        }
        ```
+    Yaml
+    ----
+     * Support for silently ignoring duplicate keys in YAML has been deprecated and
+       will lead to a `ParseException` in Symfony 4.0.