ditto in README

README.md

@@ -16,7 +16,7 @@ $server = new Taproot\IndieAuth\Server([
 
 	// An authentication callback function, which either returns data about the current user,
 	// or redirects to/implements an authentication flow.
-	'handleAuthenticationRequestCallback' => function (ServerRequestInterface $request, string $authenticationRedirect, ?string $normalizedMeUrl) {
+	'authenticationHandler' => function (ServerRequestInterface $request, string $authenticationRedirect, ?string $normalizedMeUrl) {
 		// If the request is authenticated, return an array with a `me` key containing the
 		// canonical URL of the currently logged-in user.
 		if ($userUrl = getLoggedInUserUrl($request)) {