fix: set proper swiss qr version as expected by the guidelines

closes issue #23

src/components/SwissInvoice.tsx

@@ -53,7 +53,8 @@ const encodeSwissQrInvoice = (
   invoiceData: InvoiceData,
   { type = "SPC" } = {}
 ) => {
-  const VERSION = "0220"; // 2.20
+  // This code implements version 2.2! But the guidelines require that this stays fixed as 2.0 ;)
+  const VERSION = "0200";
   const CODING = 1; // utf-8
   const LINE_BREAK = "\n";
   const END_INDICATOR = "EPD";