title: Sequelize doesn`t close connection
body: <p>i have a problem with a connection, it doesnt disconnect. I have an array with 3273 items and I was mapping the list and create all items individually, but at the end the connection doesnt close, please help !!!!</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>function set_db(products_list) {
      products_list.map(function(p) {
          SupplierProduct.findOrCreate({
              where: {
                  product_code: p.ProductCode
              },
              defaults: {
                  oem_numbers: p.OemNumbers,
                  description: p.Description,
                  description2: p.Description2,
                  weight: p.Weight,
                  normal_dealer_cost: p.NormalDealerCost,
                  suggested_sell_price: p.SuggestedSellPrice,
                  product_classification_code: p.ProductClassificationCode,
                  battery_type_or_page_yields: p.BatteryTypeOrPageYields,
                  also_fits: p.AlsoFits,
                  units: p.Units,
                  prod_url: p.ProdUrl
              }
          }).spread((product, created) =&gt; {
              console.log(product);
          }).catch((err) =&gt; {
              console.log(err);
          }).finally(() =&gt; sequelize.close());
      });
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>After function ends the connection doesn´t close.</p>