[ubu] Add missing whitespace

youtube_dl/extractor/__init__.py

@@ -327,7 +327,7 @@ from .tutv import TutvIE
 from .tvigle import TvigleIE
 from .tvp import TvpIE
 from .tvplay import TVPlayIE
-from.ubu import UbuIE
+from .ubu import UbuIE
 from .udemy import (
     UdemyIE,
     UdemyCourseIE