docs: removed strict mode warning for React 18

Author: crashmax-dev

README.md

@@ -106,11 +106,6 @@ fireworks.start()
 npm install @fireworks-js/react
 ```
 
-> **Warning**\
-> StrictMode in React 18 will lead useEffect called twice.\
-> Fireworks speed will be broken (in development mode).
-
-
 #### [`@fireworks-js/preact`](https://github.com/crashmax-dev/fireworks-js/tree/master/examples/with-preact)
 
 ```sh