Render the QR Code matrix in SVG format

qr_code_content
|> QRCodeEx.encode()
|> QRCodeEx.svg(color: "#cc6600", shape: "circle", width: 300)

You can specify the following attributes of the QR code:

• background_color: In hexadecimal format or :transparent. The default is #FFF
• color: In hexadecimal format. The default is #000
• shape: Only square or circle. The default is square
• width: The width of the QR code in pixel. Without the width attribute, the QR code size will be dynamically generated based on the input string.
• viewbox: When set to true, the SVG element will specify its height and width using viewBox, instead of explicit height and width tags.

Default options are [color: "#000", shape: "square"].