title: How to enable explicit_defaults_for_timestamp?
body: <p>When I try to start my mySQL server I get message:</p>
  
  <blockquote>
    <p>[Warning] TIMESTAMP with implicit DEFAULT value is deprecated.
    <br>Please use --explicit_defaults_for_timestamp server option (see
    documentation for more details).</p>
  </blockquote>
  
  <p>I find answer on:<br>
  <a href="http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_explicit_defaults_for_timestamp" rel="noreferrer">http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_explicit_defaults_for_timestamp</a></p>
  
  <p>But how to enable it? Where? </p>