sunmi_printer_plus 2.0.0

Support V2 Pro Sunmi Label Version and Null safety.

Changelog

2.0.0

• 2.0.0 release
• Update Readme
• Enable Null Safety Support
• Label Printing Support For Sunmi V2 Pro
• Refine existing features
• Minor bug fixed
• Included Qrcode print
• Included Column print
• Included Barcode print
• Included method to print with escpos
• Included bold mode On/Off
• Included font size change:
  • Extra small
  • Small
  • Medium (default)
  • Large
  • Extra Large