fix: readme format (#869)

Co-authored-by: 黃首翰（ArvinH） <arvinhuang@mercari.com>

README.md

@@ -207,6 +207,7 @@ Lots coming soon, check out the [roadmap](./ROADMAP.md).
 - Dollar to food emoji caculator by [@gmlwo530](https://github.com/gmlwo530)
   ([Demo](https://dollar-to-food-emoji.web.app/)) ([Github](https://github.com/gmlwo530/dollar-to-food-emoji))
 - [zh-TW] Taiwan Real-time Air Quality Index by [@ArvinH](https://github.com/ArvinH)([Demo](https://codesandbox.io/s/simpleradar-aqi-with-tooltip-select-data-react-spring-item3?file=/Radar.tsx))([Tutorial](https://blog.arvinh.info/tech/datavis-visx))
+
 Have a project that's using `visx`? Open a pull request and we'll add it to the list.
 
 ## FAQ