Added action:post.downvote hook

src/favourites.js

@@ -131,7 +131,14 @@ var async = require('async'),
 				return callback(new Error('[[error:not-enough-reputation-to-downvote]]'));
 			}
 
-			toggleVote('downvote', pid, uid, callback);
+			toggleVote('downvote', pid, uid, function(err, votes) {
+				if (err) return callback(err);
+				plugins.fireHook('action:post.downvote', {
+					pid: pid,
+					uid: uid
+				});
+				callback(null, votes);
+			});
 		});
 	};