message: Added link to Discord community
diff: <!-- markdownlint-enable no-inline-html -->
  -[Demos][demo-url] | [Documentation](./docs/README.md)
  +[Demos][demo-url] | [Documentation](./docs/README.md) | [Discord community](https://discord.gg/E6UthXZ)
  TradingView Lightweight Charts are one of the smallest and fastest financial HTML5 charts.
  