Fix as per OTP 26 constraints

dialyzer is `unknown` by default now

Author: paulo-ferraz-oliveira

src/elli_example_callback.erl

@@ -297,7 +297,7 @@ chunk_loop(Ref, N) ->
 %% `file_error' is sent when the user wants to return a file as a
 %% response, but for some reason it cannot be opened.
 -spec handle_event(Event, Args, Config) -> ok when
-      Event  :: elli:event(),
+      Event  :: elli_handler:event(),
       Args   :: elli_handler:callback_args(),
       Config :: [tuple()].
 handle_event(elli_startup, [], _) -> ok;

src/elli_middleware.erl

@@ -86,7 +86,7 @@ handle_event(Event, Args, Config) ->
 
 -spec do_init(Req, Callbacks) -> {ok, standard | handover} when
       Req       :: elli:req(),
-      Callbacks :: elli_handler:callbacks().
+      Callbacks :: [elli_handler:callback()].
 do_init(_, []) ->
     {ok, standard};
 do_init(Req, [{Mod, Args}|Mods]) ->