Sawyer Hood 9425bcff8f Updated a warning string in upgrade.js
Summary:
I inserted an 'in' in the warning message that is displayed when the user's package.json file doesn't have a valid version number for react native.

Test plan
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-run upgrade.js on a project with an invalid version number.
Closes https://github.com/facebook/react-native/pull/7314

Differential Revision: D3245839

fb-gh-sync-id: e38f3be0884d8c75f9610faced85d5c81c24a49e
fbshipit-source-id: e38f3be0884d8c75f9610faced85d5c81c24a49e
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