Update README.md

Author: graham22

README.md

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 # ModbusTool
 ## A modbus TCP and RTU master and slave tool with import and export functionality.
 
-|If you find this project useful or interesting, please help support further development!|[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=graham.a.ross%40gmail.com&item_name=Support+ModbusTool+development&currency_code=USD&source=url)|
+|If you find this project useful or interesting, please help support further development!|[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](https://paypal.me/classicdiy?country.x=CA&locale.x=en_US)|
 |---|---|
 
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