Update devDependencies for React Native 0.40.0

See discussion in itinance#234

2.0.1-rc.2

using `rc` tag in version number

2.0.1-0

2.0.0

Bumped version to `1.5.1`

Bumped version to `1.5.0`

Merge pull request itinance#78 from liuchungui/patch-1

Update README.md