react-express-mysql: get version from mysql

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-express-mysql/backend/src/database.js

@@ -0,0 +1,7 @@
+const knex = require('knex');
+const { database } = require('./config');
+
+module.exports = knex({
+  client: 'mysql2',
+  connection: database,
+});