Rename Missing Number.js to itsPiyush01_MissingNumber.js

Author: Piyush Ranjan

nodejs/itspiyush01/Missing Number.js nodejs/itspiyush01/itsPiyush01_MissingNumber.js

@@ -30,4 +30,4 @@ rl.on("close", () => {
   }
   xor = xor ^ n;
   console.log(xor);
-});
+});