added explanation for Literal import try except block

Author: rafsaf

{{cookiecutter.project_name}}/app/core/config.py

@@ -25,10 +25,12 @@
 import toml
 from pydantic import AnyHttpUrl, AnyUrl, BaseSettings, EmailStr, validator
 
+# Literal from typing_extensions for python 3.6 and 3.7 support, remove if not needed
 try:
     from typing import Literal
 except ImportError:
     from typing_extensions import Literal
+#
 
 PROJECT_DIR = Path(__file__).parent.parent.parent
 pyproject_content = toml.load(f"{PROJECT_DIR}/pyproject.toml")["tool"]["poetry"]