added docstrings in config.py

config.py

@@ -4,6 +4,12 @@ from dataclasses import dataclass
 
 @dataclass
 class Config:
+    """
+    Notifier config dataclass.
+
+    * `api_token`: telegram api token.
+    * `param bot_owner`: telegram id of bot owner.
+    """
     api_token: str
     bot_owner: int
 
@@ -13,21 +19,23 @@ class ConfigError(Exception):
 
 
 _api_token = getenv('LTLNOTIFIER_API_TOKEN')
+# Check api token
 if not _api_token:
     raise ConfigError('virtual environment LTLNOTIFIER_API_TOKEN not set.')
 if len(_api_token) != 45 or _api_token[9] or not _api_token[:9].isdigit():
-    raise ConfigError('Virtual environment LTLNOTIFIER_API_TOKEN incorrect')
+    raise ConfigError('virtual environment LTLNOTIFIER_API_TOKEN incorrect.')
 
 _bot_owner = getenv('LTLNOTIFIER_BOT_OWNER')
+# Check bot owner
 if not _bot_owner:
-    raise ConfigError('Virtual environment LTLNOTIFIER_BOT_OWNER not set')
+    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER not set.')
 try:
     if len(_bot_owner) != 9:
         raise ValueError
     _bot_owner = int(_bot_owner)
 except ValueError:
-    raise ConfigError('Virtual environment LTLNOTIFIER_BOT_OWNER incorrect')
+    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER incorrect.')
 
 config = Config(api_token=_api_token, bot_owner=_bot_owner)
 
-__all__ = ['Config', config]
+__all__ = ['Config', 'config']