update readme

Author: ahmad88me

README.md

@@ -6,6 +6,8 @@ This generates a fully functioning apis using generated serializers and class-vi
 1. Install it in your django project `pip install django-rest-gen`.
 2. Run it and specify your app `python -m django-rest-gen`. You should also
 specify the appropriate arguments (e.g., ` python -m django-rest-gen  --settings iires/settings.py --apppath iirapp`)
+*Note: if the file already exists and is not empty, the content will be printed instead in the stdout*
+
 ## Arguments
 ```
 usage: django-rest-gen [-h] [--pythonpath PYTHONPATH] --settings SETTINGS --apppath APPPATH [--views VIEWS]
@@ -24,3 +26,8 @@ optional arguments:
 
 # Limitations
 * Flat. No nesting is provided as it depends on user preferences.
+
+
+# Rebuild package
+1. `python3 -m build`
+2. `python3 -m twine upload dist/*`