Update to db.js

Bookings/src/db.js

@@ -1,7 +1,7 @@
 var mariadb = require('mariadb');
 require('dotenv').config();
 
-var pool = mariadb.createPool({
+const pool = mariadb.createPool({
     host: process.env.DB_HOST, 
     user: process.env.DB_USER, 
     password: process.env.DB_PASS,