fix(useKeyboardJs): fix argument type error

Author: dabuside

docs/useKeyboardJs.md

@@ -37,5 +37,5 @@ yarn add keyboardjs
 ## Reference
 
 ```js
-useKeyboardJs(combination: string): [isPressed: boolean, event?: KeyboardEvent]
+useKeyboardJs(combination: string | string[]): [isPressed: boolean, event?: KeyboardEvent]
 ```

src/useKeyboardJs.ts

@@ -1,7 +1,7 @@
 import { useEffect, useState } from 'react';
 import useMount from './useMount';
 
-const useKeyboardJs = (combination: string) => {
+const useKeyboardJs = (combination: string | string[]) => {
   const [state, set] = useState<[boolean, null | KeyboardEvent]>([false, null]);
   const [keyboardJs, setKeyboardJs] = useState<any>(null);