Update argument names and documentation for clarity in main.py and README.md

readme.md

@@ -32,6 +32,14 @@ python main.py
 
 Logs are written to the `log` file.
 
+### Feature-specific Arguments
+
+- `--non-series`  
+  Include non-series books (books not part of a numbered series).
+
+- `--oncoming`  
+  Show books that are yet to be released.
+
 ## Project Structure
 
 - [main.py](main.py): Entry point and main logic