fix linter

Author: sabuhish

fastapi_mail/fastmail.py

@@ -176,7 +176,7 @@ async def __prepare_messages_for_sending(
                         template_obj = await self.get_mail_template(
                             template_env, template_name
                         )
-                    prepared = await self.__prepare_message(msg, template_obj)
+                    prepared = await self._prepare_message(msg, template_obj)
                 else:
                     if template_env is None:
                         template_env = self.config.template_engine()  # type: ignore
@@ -192,7 +192,7 @@ async def __prepare_messages_for_sending(
                         msg, html_template_obj, plain_template_obj
                     )
             else:
-                prepared = await self.__prepare_message(msg)
+                prepared = await self._prepare_message(msg)
 
             prepared_messages.append(prepared)
 

fastapi_mail/msg.py

@@ -71,7 +71,7 @@ async def attach_file(self, message: MIMEMultipart, attachment: Any):
             else:
                 part = MIMEBase(_maintype="application", _subtype="octet-stream")
 
-            await file.seek(0) 
+            await file.seek(0)
             part.set_payload(await file.read())
             encode_base64(part)
             await file.close()