Error on starting project on iOS simulator

[manurana]

Describe the bug
Starting the project on an iOS sim gives an error.

To Reproduce
Steps to reproduce the behavior:

1. Follow instructions in SETUP.md for native
2. Press i on the expo prompt to start an iOS sim (iPhone6, iOS 11.4)
3. App starts with an error

Expected behavior
App should start without an error

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop

• OS: N/A
• Browser: N/A
• Browser Version: N/A

Smartphone

• Device: iPhone6 simulator
• OS: iOS 11.4 (simulator)
• Browser: N/A
• Browser Version: N/A

Library

• leaf-ui: latest github master
• node: 8.9.0
• npm: 5.8.0

Additional Context
I see the following warnings when I first run npm install in the app directory

npm WARN @storybook/react-native@3.4.3 requires a peer of react-native@>=0.51.0 but none is installed. You must install peer dependencies yourself.
npm WARN react-native@0.50.3 requires a peer of react@16.0.0 but none is installed. You must install peer dependencies yourself.

[kashishgrover]

fixed in #90

Have just fixed the stories for now.