message: Add npm badges
diff: # react-native-sentry
  +[![npm version](https://img.shields.io/npm/v/react-native-sentry.svg)](https://img.shields.io/npm/v/react-native-sentry.svg)
  +[![npm dm](https://img.shields.io/npm/dm/react-native-sentry.svg)](https://img.shields.io/npm/dm/react-native-sentry.svg)
  +[![npm dt](https://img.shields.io/npm/dt/react-native-sentry.svg)](https://img.shields.io/npm/dt/react-native-sentry.svg)
  +
  **This is an early beta release that only supports iOS**
  *Requirements:*
  