title: Sequelize version 3.30.2 - execute raw query in migration
body: <p>So I have to perform a complex migration, and for my version of sequelize I have to use plain old SQL. This happens because in version 3.30 <code>QueryInterface</code> does not include the <code>addConstraint</code> and <code>removeConstraint</code>.</p>
  
  <p>How can I execute a raw SQL query in my migration file?</p>
  
  <p><strong>Migration</strong>:</p>
  
  <pre><code>'use strict';
  
  module.exports = {
    up: (queryInterface, Sequelize) =&gt; {
  
      // queryInterface.query does not exist :S
      // queryInterface.raw does not exist :S
      return queryInterface.query(' \
          ALTER TABLE "people" \
          DROP CONSTRAINT "peoplePartners_peopleId_fkey" \
      ');
  
    },
  
    down: (queryInterface, Sequelize) =&gt; {
  
    }
  };
  </code></pre>
  
  <p>Of course, my real query is way more complex than the one shown above, which is for explanation purposes.</p>
  
  <p>How do I perform a raw query in a db migration file in Sequelize 3.30?</p>