fix(babel-plugin-react-intl): fix README link

Long Ho · Long Ho · commit afc92d4e35aa · 2020-04-13T16:10:23.000-04:00
diff --git a/packages/babel-plugin-react-intl/README.md b/packages/babel-plugin-react-intl/README.md
@@ -84,4 +84,4 @@ require('@babel/core').transform('code', {
 }); // => { code, map, ast, metadata['react-intl'].messages, metadata['react-intl'].meta };
 ```
 
-[react intl]: http://formatjs.io/react/
+[react intl]: https://github.com/formatjs/react-intl
