Protect 3p lib imports + update requirements

gui.py

@@ -13,8 +13,14 @@ from typing import (
     Any, Optional, List, Dict, Set, Tuple, TypedDict, Iterable, NoReturn, TYPE_CHECKING
 )
 
-from PIL import Image
-import pystray
+try:
+    from PIL import Image
+except ModuleNotFoundError as exc:
+    raise ImportError("You have to run 'pip install Pillow' first") from exc
+try:
+    import pystray
+except ModuleNotFoundError as exc:
+    raise ImportError("You have to run 'pip install pystray' first") from exc
 
 from version import __version__
 from constants import FORMATTER, WS_TOPICS_LIMIT, MAX_WEBSOCKETS, State

requirements.txt

@@ -1,2 +1,3 @@
 aiohttp>2.0,<4.0
-pywin32
+Pillow
+pystray

twitch.py

@@ -14,8 +14,8 @@ from typing import (
 
 try:
     import aiohttp
-except ImportError:
-    raise ImportError("You have to run 'python -m pip install aiohttp' first")
+except ModuleNotFoundError as exc:
+    raise ImportError("You have to run 'pip install aiohttp' first") from exc
 
 from channel import Channel
 from gui import GUIManager, LoginData