Update React Native Modal

• Update react-native-modal to version 6.4.0.

App Whitelist Property

• Added property to showLocation to specify a whitelist of apps.

Fixed App Parameter Bug

• Bugfix of app option of showLocation function.

Fixed `cancelText` bug

• Fixed a bug with the cancelText parameter.
• Added example app code.

Fix for Missing Depdendencies

• Fixed a missing dependency in package.json.

Version 2.0

• Added react-native-modal with app icons.

Customize Modal Text

• Added options to showLocation function to customize modal text.