diff --git a/.github/workflows/linter.yaml b/.github/workflows/linter.yaml
index 938cf04..d6ce4ae 100644
--- a/.github/workflows/linter.yaml
+++ b/.github/workflows/linter.yaml
@@ -3,6 +3,8 @@ name: CI
 on: 
   push:
     branches: '**'
+  pull_request:
+    branches: '**'
 
 jobs:
   ci:
diff --git a/fastapi_mail/schemas.py b/fastapi_mail/schemas.py
index 928b74d..4bf0de8 100644
--- a/fastapi_mail/schemas.py
+++ b/fastapi_mail/schemas.py
@@ -4,7 +4,7 @@
 from typing import Dict, List, Optional, Union
 
 from pydantic import BaseModel, EmailStr, validator
-from starlette.datastructures import UploadFile, Headers
+from starlette.datastructures import Headers, UploadFile
 
 from fastapi_mail.errors import WrongFile