title: Is there a way of dynamically changing the email template subject field on SES templates?
body: <p>I am currently using SES to store email templates with serverless-ses-template on deployment. <br>
  The templates get stored with the following parameters, both of which are mandatory:</p>
  
  <pre><code>templateId: 'status-template',
  templateSubject: 'Some Title'
  </code></pre>
  
  <p>In my Lambda, I get the template I need, I map the values to the template and send it:</p>
  
  <pre><code>const email = {
          Destination: {
              ToAddresses: targetAddresses
          },
          Source: 'sourcemail@mail.com',
          Template: "status-template",
          TemplateData: JSON.stringify(templateData)
      };
  
  await ses.sendTemplatedEmail(email).promise();
  </code></pre>
  
  <p>Once this email is recieved, the subject is expectedly "Some Title" as in the template. <br>
  Is there a way of dynamically changing that title before sending it i.e. changing the title from "Some Title" to "Other Title"?</p>