diff --git a/gmail/gmail_tools.py b/gmail/gmail_tools.py
index fdd2327..2d817f3 100644
--- a/gmail/gmail_tools.py
+++ b/gmail/gmail_tools.py
@@ -38,9 +38,14 @@ GMAIL_REQUEST_DELAY = 0.1
 HTML_BODY_TRUNCATE_LIMIT = 20000
 
 GMAIL_METADATA_HEADERS = [
-    "Subject", "From", "To", "Cc",
-    "Message-ID", "In-Reply-To", "References",
-    "Date"
+    "Subject",
+    "From",
+    "To",
+    "Cc",
+    "Message-ID",
+    "In-Reply-To",
+    "References",
+    "Date",
 ]
 LOW_VALUE_TEXT_PLACEHOLDERS = (
     "your client does not support html",
@@ -80,8 +85,6 @@ class _HTMLTextExtractor(HTMLParser):
         return " ".join("".join(self._text).split())
 
 
-
-
 def _html_to_text(html: str) -> str:
     """Convert HTML to readable plain text."""
     try: