Added info on changes to setting validation subpath to UPGRADE-2.1.md

UPGRADE-2.1.md

@@ -1,4 +1,4 @@
-UPGRADE FROM 2.0 to 2.1
+UPGRADE FROM 2.0 to 2.1
 =======================
 
 ### General
@@ -251,6 +251,63 @@ UPGRADE FROM 2.0 to 2.1
         }
     }
     ```
+* The method `setPropertyPath()` in the ExecutionContext class
+    was removed.
+
+    You should use the `addViolationAtSubPath()` method on the
+    `ExecutionContext` object instead.
+
+    Before:
+
+    ```
+    public function isPropertyValid(ExecutionContext $context)
+    {
+        // ...
+        $propertyPath = $context->getPropertyPath() . '.property';
+        $context->setPropertyPath($propertyPath);
+        $context->addViolation('Error Message', array(), null);
+    }
+    ```
+
+    After:
+
+    ```
+    public function isPropertyValid(ExecutionContext $context)
+    {
+        // ...
+        $context->addViolationAtSubPath('property', 'Error Message', array(), null);
+
+    }
+    ```
+
+  * The method `setPropertyPath()` in the ExecutionContext class
+    was removed.
+
+    You should use the `addViolationAtSubPath()` method on the
+    `ExecutionContext` object instead.
+
+    Before:
+
+    ```
+    public function isPropertyValid(ExecutionContext $context)
+    {
+        // ...
+        $propertyPath = $context->getPropertyPath() . '.property';
+        $context->setPropertyPath($propertyPath);
+        $context->addViolation('Error Message', array(), null);
+    }
+    ```
+
+    After:
+
+    ```
+    public function isPropertyValid(ExecutionContext $context)
+    {
+        // ...
+        $context->addViolationAtSubPath('property', 'Error Message', array(), null);
+
+    }
+    ```
 
   * The options passed to the `getParent()` method of form types no longer
     contain default options.