Define MIN_COMPOSER_HEIGHT for Platform.web

[jadczyk]

Issue Description

I'm using your plugin on the web (using more and more popular react-native-web), but MIN_COMPOSER_HEIGHT is not defined for web in Constant.js. Therefore, height of the container is not calculated and AnimatedView height is not set which results in messages overflowing under the input. Besides, input height is also wrong.

This fixes both issues and doesn't influence apps at all:
export const MIN_COMPOSER_HEIGHT = Platform.select({ ios: 33, android: 41, web: 44, });

Additional Information

• react-native-gifted-chat version: 0.4.3
• Platform(s) (iOS, Android, or both?): web

[stale]

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