Include URL in new dates found mail.

check.py

@@ -89,7 +89,7 @@ def load_previous_dates() -> set[str]:
     return set()
 
 
-def save_dates(dates: list[date]):
+def save_dates(dates: list[date]) -> None:
     """Save current dates to file as ISO strings."""
     DATA_DIR.mkdir(parents=True, exist_ok=True)
     with open(DATA_FILE, "w") as f:
@@ -113,7 +113,11 @@ def send_email(new_dates: list[date], config: configparser.ConfigParser) -> None
     """Send email with new dates."""
     email_config = config["mail"]
     subject = "New Ferrocarril Central Dates Available!"
-    body = "New dates found:\n" + "\n".join(d.strftime("%d %B %Y") for d in new_dates)
+    body = (
+        "New dates found:\n"
+        + "\n".join(d.strftime("%d %B %Y") for d in new_dates)
+        + f"\n\n{URL}"
+    )
 
     msg = MIMEText(body)
     msg["Subject"] = subject