[FrameworkBundle] update upgrade instructions
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@ -636,6 +636,11 @@ UPGRADE FROM 2.x to 3.0
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be removed in Symfony 3.0. Use the `debug:config`, `debug:container`,
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`debug:router`, `debug:translation` and `lint:yaml` commands instead.
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* The base `Controller`class is now abstract.
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* The visibility of all methods of the base `Controller` class has been changed from
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`public` to `protected`.
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* The `getRequest` method of the base `Controller` class has been deprecated
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since Symfony 2.4 and must be therefore removed in 3.0. The only reliable
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way to get the `Request` object is to inject it in the action method.
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