Add quit command in interactive migration

todoist_taskwarrior/cli.py

@@ -97,6 +97,7 @@ def task_prompt(**task_data):
     r - rename task
     p - change priority
     t - change tags
+    q - quit immediately
     ? - print help
     """
     callbacks = {
@@ -121,6 +122,9 @@ def task_prompt(**task_data):
             'priority': priority_prompt(task_data['priority']),
         },
 
+        # Quit
+        'q': lambda: exit(1),
+
         # Help message
         '?': lambda: task_prompt_help() or task_data,
     }