update props listed in README

Author: ugogo

README.md

@@ -44,7 +44,8 @@ export default function App() {
 | ----------- | ---------- | ---------- | -------- | --------------------------------------------------------- |
 | autoFocus   | `boolean`  | false      | false    | Focus on render                                           |
 | length      | `number`   | `4`        | false    | How many items will be rendered                           |
-| onChange    | `function` | `() => {}` | true     | Function called when the value changes                    |
+| onChange    | `function` | `() => {}` | false     | Function called when the value changes                    |
+| onCompleted | `function` | `() => {}` | false    | Function called when the code is completed                |
 | placeholder | `string`   | `·`        | false    | String rendered in each item when no value has been typed |
 | value       | `string`   | `() => {}` | false    | Control internal input value                              |
 

src/index.tsx

@@ -12,8 +12,8 @@ const KEY_CODE = {
 type Props = {
   autoFocus?: boolean;
   length?: number;
-  onChange?: (data: string) => any;
-  onCompleted?: (data: string) => any;
+  onChange?: (data: string) => void;
+  onCompleted?: (data: string) => void;
   placeholder?: string;
   value?: string;
 };