Update list command description

Author: Yukaii

README.md

@@ -177,7 +177,7 @@ _See code: [src/commands/import.ts](https://github.com/hackmdio/hackmd-cli/blob/
 
 ## `hackmd-cli list`
 
-List notes
+List owned notes or team notes (HackMD-only feature)
 
 ```
 USAGE

src/commands/list.ts

@@ -4,7 +4,7 @@ import cli from 'cli-ux'
 import {APIClient} from '../api'
 
 export default class History extends Command {
-  static description = 'List notes'
+  static description = 'List owned notes or team notes (HackMD-only feature)'
 
   static examples = [
     `$ hackmd-cli list