update type signature

Author: quantizor

types/stylis-rtl.d.ts

@@ -1,3 +1,8 @@
-declare function stylisRTLPlugin(context: number, content: string): string | undefined;
+declare function stylisRTLPlugin(
+  context: number,
+  content: string,
+  children: Object[],
+  callback: Function
+): string | undefined;
 
 export default stylisRTLPlugin;