title: How to enforce tls version to TLSv using `sqlalchemy.create_engine` to connect an AWS RDS MySQL database?
body: <p>I am using the following code to connect to my AWS RDS MySQL database:</p>
  <pre><code>mysql_engine = sqlalchemy.create_engine('mysql://xxx:xxx@xxx:xxx')
  </code></pre>
  <p>Now I want to enforce it to use <code>TLSv1.2</code>, how can I achieve this? I've read a couple of documentations online but couldn't found anything. Thanks.</p>