[DI] Add upgrade note about case insenstive params

ro0NL · ro0NL · commit 38909963921e · 2017-08-31T14:57:27.000+02:00
diff --git a/UPGRADE-3.4.md b/UPGRADE-3.4.md
@@ -50,6 +50,8 @@ DependencyInjection
 
  * Top-level anonymous services in XML are deprecated and will throw an exception in Symfony 4.0.
 
+ * Case insensitivity of parameter names is deprecated and will be removed in 4.0.
+
 Debug
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