Simple type fix in useKeyPress

Author: nikasepiskveradze

src/pages/useKeyPress.md

@@ -40,7 +40,7 @@ function App() {
 // Hook
 function useKeyPress(targetKey) {
   // State for keeping track of whether key is pressed
-  const [keyPressed, setKeyPressed] = useState(false);
+  const [keyPressed, setKeyPressed] = useState<boolean>(false);
   // If pressed key is our target key then set to true
   function downHandler({ key }) {
     if (key === targetKey) {