Update README.md

replaced form with static link

README.md

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 Rubberduck is free, but keeping it visible online isn't. Donate to help us pay for hosting and keep the blog free of ads!
 
-<div>
-<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
-<input type="hidden" name="cmd" value="_donations" />
-<input type="hidden" name="business" value="UY5K5X36B7T2S" />
-<input type="hidden" name="currency_code" value="CAD" />
-<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif" border="0" name="submit" title="PayPal - The safer, easier way to pay online!" alt="Donate with PayPal button" />
-<img alt="" border="0" src="https://www.paypal.com/en_CA/i/scr/pixel.gif" width="1" height="1" />
-</form>
-</div>
+[![](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=UY5K5X36B7T2S&currency_code=CAD&source=url)
 
 As agreed with core contributors, donations in excess of what's needed to cover our fees for a year, will be donated to the [Multiple Sclerosis Society of Canada](https://mssociety.ca/).