Updated reCAPTCHA v2 to use api.js method

templates/post_form.html

@@ -74,7 +74,7 @@
 				{{ antibot.html() }}
 			</th>
 			<td>
-				<script type="text/javascript" src="//www.google.com/recaptcha/api/challenge?k={{ config.recaptcha_public }}"></script>
+				<div class="g-recaptcha" data-sitekey="{{ config.recaptcha_public }}"></div>
 				{{ antibot.html() }}
 			</td>
 		</tr>