updates readme and bumps version

Merge pull request #5 from vessp/master

Merge pull request #9 from stevehollaar/master

0.18.7

Remove unnecessary flex:1

bump

Merge pull request #7 from yueshuaijie/textinput_props

Add prop: textInputProps as a dict which will be props of text input.

watch changes to default value

updates readme

updates example to run with 0.27.2

bumps version

Merge pull request #4 from sibelius/feature/remove_portal

fix regression on initial default value

remove Portal dep, fix jaysoo/react-native-prompt#3 and fix jaysoo/react-native-prompt#1 on example