Update 2016-12-05-easier-upgrades.md
Update 2016-12-05-easier-upgrades.md

Summary:
> The logic behind react-native-git-upgrade described above is going to power the standard react-native upgrade starting with React Native version 0.40.0.
This means that if you are upgrading from version 0.40.0 or higher, you will be able to simply run react-native upgrade in your project without having to install anything globally.

I hadn't seen any logic related to this description in either practice nor [the source code](https://github.com/facebook/react-native/blob/master/local-cli/upgrade/upgrade.js) . Did I misunderstand anything or the plan has been changed since this blog post? ncuillery
Closes https://github.com/facebook/react-native/pull/12758

Differential Revision: D4681959

Pulled By: mkonicek

fbshipit-source-id: 782d243bd92e51cbfcf83995fdcbb569fcb7bbc1

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