Use hash instead of pipe in cache key to fix invalid character in cac…

…he directory name on windows (closes statamic#952)

src/Auth/ThrottlesLogins.php

@@ -98,7 +98,7 @@ protected function fireLockoutEvent(Request $request)
      */
     protected function throttleKey(Request $request)
     {
-        return Str::lower($request->input($this->username())).'|'.$request->ip();
+        return Str::lower($request->input($this->username())).'#'.$request->ip();
     }
 
     /**