Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

1. react-native -v: 0.48.2
2. node -v: 8.4.0
3. npm -v: 4.6.1

Then, specify:

• Target Platform: Android

• Development Operating System: Windows 10 x64

Steps to Reproduce

1. react-native-git-upgrade on a project with react@16.0.0-beta.5 or greater

Expected Behavior

Keep current version that matches fresh react-native init, that is 16.0.0-beta.5

Actual Behavior

It will try to install 16.0.0-alpha.12, whatever the version of react already installed. this leads to inconsistencies and problems like #14209 since different tools might have different versions installed (like react-test-renderer)

Reproducible Demo