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+* Deprecate `secrets.secret_token`.
+
+ The architecture for secrets had a big upgrade between Rails 3 and Rails 4,
+ when the default changed from using `secret_token` to `secret_key_base`.
+
+ `secret_token` has been soft deprecated in documentation for four years
+ but is still in place to support apps created before Rails 4.
+ Deprecation warnings have been added to help developers upgrade their
+ applications to `secret_key_base`.
+
+ *claudiob*, *Kasper Timm Hansen*
+
* Return an instance of `HashWithIndifferentAccess` from `HashWithIndifferentAccess#transform_keys`.
*Yuji Yaginuma*