fix depends_cube

__pkginfo__.py

@@ -45,6 +45,6 @@ for dname in ('entities', 'views', 'sobjects', 'hooks', 'schema', 'data', 'i18n'
 
 __depends_cubes__ = {'registration': '>= 0.2.1'}
 __depends__ = {'cubicweb': '>= 3.5.0'}
-__use__ = ()
+__use__ = tuple(__depends_cubes__)
 __recommend__ = ()