Remove middleware interface.

app/Http/Middleware/Authenticate.php

@@ -2,9 +2,8 @@
 
 use Closure;
 use Illuminate\Contracts\Auth\Guard;
-use Illuminate\Contracts\Routing\Middleware;
 
-class Authenticate implements Middleware {
+class Authenticate {
 
 	/**
 	 * The Guard implementation.

app/Http/Middleware/RedirectIfAuthenticated.php

@@ -3,9 +3,8 @@
 use Closure;
 use Illuminate\Contracts\Auth\Guard;
 use Illuminate\Http\RedirectResponse;
-use Illuminate\Contracts\Routing\Middleware;
 
-class RedirectIfAuthenticated implements Middleware {
+class RedirectIfAuthenticated {
 
 	/**
 	 * The Guard implementation.