Fix get_help_epilog() error with doit 0.32.0

nbcourse/__init__.py

@@ -13,7 +13,7 @@ def get_help_epilog() -> str:
     """Instanciate a minimal nbcourse to return help string"""
     course = NbCourse()
     loader = ClassTaskLoader(course)
-    return MyDoit(loader).get_help()
+    return MyDoit(task_loader=loader).get_help()
 
 
 def main():

nbcourse/mydoit.py

@@ -38,7 +38,8 @@ class MyDoit(DoitMain):
 
         # get list of available commands
         sub_cmds = self.get_cmds()
-        doit_help = MyHelp(config=self.config,
+        doit_help = MyHelp(task_loader=self.task_loader,
+                           config=self.config,
                            bin_name='',
                            cmds=sub_cmds)
         return doit_help.get_usage(sub_cmds.to_dict())