Object shape and doc fixes

README.md

@@ -14,6 +14,8 @@ Install dependencies:
 
 Run as a CLI command:
 
+*Please note the handle has to be in the format @user:instance.org`
+
 ```
 python main.py [-h] --tag TAG --token TOKEN --instance INSTANCE emoji_file [emoji_file ...]
 

main.py

@@ -10,6 +10,7 @@ import dacite
 import aiohttp
 import typing
 import urllib.parse
+from typing import Optional
 from dataclasses import dataclass
 from tqdm import tqdm
 
@@ -30,7 +31,7 @@ class EmojiDef:
 @dataclass
 class PackMeta:
     display_name: str
-    usage: list[str]
+    usage: Optional[list[str]]
 
 
 @dataclass