FIX: 3.1 extension API updates

_config.php

@@ -14,5 +14,5 @@ if(class_exists('Comment')) {
 	 * If the comments module is installed then add the spam protection module 
 	 * to the comments form via this extension
 	 */
-	Object::add_extension('CommentingController', 'CommentSpamProtection');
+	CommentingController::add_extension('CommentSpamProtection');
 }

composer.json

@@ -9,9 +9,8 @@
 	}, {
 		"name": "Will Rossiter",
 		"email": "will@fullscreen.io"
-	}
-	],
+	}],
 	"require": {
-		"silverstripe/framework": "3.*"
+		"silverstripe/framework": "3.1.*"
 	}
 }