title: compare current year and month of date in query using sequelize
body: <p>I have the schema as following :</p>
  
  <p>Test</p>
  
  <pre><code>const test = sequelize.define('test', {
          id: {primaryKey: true, type: DataTypes.INTEGER, autoIncrement: true, allowNull: false, unique: true},
          start_date: {type: DataTypes.DATE},
             });
  
  
      return test
  </code></pre>
  
  <p>Now in different rows I have start_date as <code>2018-05-05,2018-05-06 and 2018-06-06.</code> Now what I want is ,I want to get the result <code>2018-05-05 and 2018-05-06</code>, which are for current month and year. How should I put the query for that in sequelize? </p>