fix bug in banner command

Author: ahmadnourallah

core/interpreter.py

@@ -1,5 +1,6 @@
 from utilities.color import * # import utilites
 from utilities.screen_cleaner import clear # import utilites
+from core.banner import Banner # import banner
 from core.main_completer import completer # completer import
 from imp import reload # import reload function from imp module
 from os import system