syntax error in readme.md

[sathithyayogi]

const SQLBuilder = require('json-sql-builder2');
// create a new instance of the SQLBuilder and load the language extension for mysql
var sql = new SQLBuilder('MySQL');

// lets start some query fun
var totalSalary = sql.$select({
    job_title: true,
    total_salary: { $sum: 'salary' },
    $from: 'people',
    $where: {
        job_title: { $in: ['Sales Manager', 'Account Manager'] },
        age: { $gte: 18 },
        country_code: 'US',
    },
    $groupBy: 'job_title',
});

comma missing in total_salary line