docs: update README to reflect main.py entry point rename

Author: Bit-Maximum

README.md

@@ -49,7 +49,7 @@ docker-compose build
 $ tree "FastAPI_super_template"
 src
 ├── conftest.py  # Fixtures for all tests.
-├── __main__.py  # Startup script. Starts uvicorn.
+├── main.py  # Startup script. Starts uvicorn.
 ├── services  # Package for different external services such as rabbit or redis etc.
 ├── settings.py  # Main configuration settings for project.
 ├── static  # Static content.