Add query parameters to followers (#89)

* Add query parameters to followers

* Fix followers API description

Using-the-API/API.md

@@ -107,6 +107,14 @@ Form data:
 
     GET /api/v1/accounts/:id/followers
 
+Query parameters:
+
+- `max_id` (optional): Get a list of followers with ID less than or equal this value
+- `since_id` (optional): Get a list of followers with ID greater than this value
+- `limit` (optional): Maximum number of accounts to get (Default 40, Max 80)
+
+`max_id` and `since_id` are usually get from the `Link` header.
+
 Returns an array of [Accounts](#account).
 
 #### Getting who account is following: