added an UPGRADE file for 2.4

propelorm · Jul 8, 2013 · a8c9d2d · a8c9d2d
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+UPGRADE FROM 2.3 to 2.4
+=======================
+
+When upgrading Symfony from 2.3 to 2.4, you need to do the following changes
+to the code that came from the Standard Edition:
+
+ * We recommend to comment or remove the `firephp` and `chromephp` Monolog
+   handlers as they might cause issues with some configuration (`chromephp`
+   with Nginx for instance).