docs: update README

README.md

@@ -28,12 +28,15 @@ BACKBLAZE_PASSWORD=your_password
 INVOICE_VAT_ID=DE123456789
 INVOICE_DOCUMENT_TYPE=Invoice
 INVOICE_COMPANY=My Company GmbH
-INVOICE_NOTES=Internal ref: 12345
+INVOICE_NOTES=Internal ref: 12345\nLine 2\nLine 3
 
 OUTPUT_DIR=./invoices
 BROWSER_HEADLESS=true
+DOWNLOAD_ALL_YEARS=false
 ```
 
+Notes can include literal `\n` to create line breaks in the invoice “Other” field.
+
 ## Usage
 
 ```bash
@@ -50,6 +53,7 @@ python main.py
 --document-type TYPE   Document type to select
 --company NAME         Company name to fill
 --notes TEXT           Notes to fill on invoices
+--all-years            Download invoices for all years (default: first year only)
 -v, --verbose          Verbose logging
 ```
 
@@ -59,6 +63,6 @@ CLI arguments override `.env` values.
 
 1. Logs in to `secure.backblaze.com`
 2. Navigates to the billing page
-3. Iterates over all billing groups and years
+3. Iterates over all billing groups and the selected year(s) (first year by default)
 4. For each invoice, opens the invoice page, fills the configured fields, and exports to PDF
 5. Skips already-downloaded invoices