title: Configure the connection_collation with SQLAlchemy
body: <p>I'm attempting to get SQLAlchemy to connect to MySQL with a <code>collation_connection</code> of <code>utf8mb4_unicode_ci</code>. </p>
  
  <p>My sever and database are both using the <code>utf8mb4_unicode_ci</code> collation. Without any configuration changes my <code>collation_connection</code> is <code>utf8_general_ci</code>. If I set the <code>charset</code> argument in the connection string to <code>charset=utf8mb4</code> the <code>collation_connection</code> is then set to <code>utf8mb4_general_ci</code>. I have been unable to find any documentation stating how to set the <code>collation_connection</code> when using SQLAlchemy. </p>