message: Update rules regarding date_format can be globally set
  see:
diff: @@ -129,7 +129,7 @@ const someRuleObj = { in: [1, 2, 3, 4] };
  </li>
  </ul>
  </div><div class="rules"><blockquote>
  -<p>Date validators always require the <code>date_format</code> rule to be always present and must preceed them in the rules order. The date validators are not enabled by default, they require <a href="http://momentjs.com">momentjs</a> in order to work. If your setup contains momentjs globally, it will be installed automatically for all validator instances. Otherwise you may want to pass the moment reference to <code>installDateTimeValidators(moment)</code> which is available both statically and on instances. Also note that the date validators always use the <a href="http://momentjs.com/guides/#/parsing/strict-mode/">'strict' moment parsing mode</a>.</p>
  +<p>Date validators always require the <code>date_format</code> rule to be always present ([or globally set](https://github.com/baianat/vee-validate/releases/tag/2.0.0-rc.7)) and must preceed them in the rules order. The date validators are not enabled by default, they require <a href="http://momentjs.com">momentjs</a> in order to work. If your setup contains momentjs globally, it will be installed automatically for all validator instances. Otherwise you may want to pass the moment reference to <code>installDateTimeValidators(moment)</code> which is available both statically and on instances. Also note that the date validators always use the <a href="http://momentjs.com/guides/#/parsing/strict-mode/">'strict' moment parsing mode</a>.</p>
  </blockquote>
  <blockquote>
  <p>In the rule signature required parameters are enclosed within <code>{}</code> like this: <code>{param}</code>. Optional parameters have a <code>?</code> at the end: <code>{optional?}</code>. Lists are enclosed withn brackets <code>[]</code>. ex: <code>[list]</code>.</note></p>
  