Flow and proptypes

[sibelius]

What do you think of adding proptypes and flow types for this package?

[tautvilas]

Prop types could be nice addition, not sure about flow - did not use it

[sibelius]

Flow look like this:

• https://github.com/jwohlfert23/react-native-tag-input/blob/master/index.js
• https://github.com/react-community/react-navigation/blob/master/src/TypeDefinition.js

[tautvilas]

Merged prop types PR #43 do not plan of adding flow types for now