Fix image.

Author: jaredhanson

README.md

@@ -20,7 +20,7 @@ hooks for controlling what occurs when authentication succeeds or fails.
   <a href="https://workos.com/?utm_campaign=github_repo&utm_medium=referral&utm_content=passport_js&utm_source=github"><img src="https://raw.githubusercontent.com/jaredhanson/passport/master/sponsors/workos.png"></a><br/>
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-  <a href="https://www.descope.com/?utm_source=PassportJS&utm_medium=referral&utm_campaign=oss-sponsorship"><img src="https://raw.githubusercontent.com/jaredhanson/passport/master/sponsors/descope.png" width="301"></a><br/>
+  <a href="https://www.descope.com/?utm_source=PassportJS&utm_medium=referral&utm_campaign=oss-sponsorship"><img src="https://raw.githubusercontent.com/jaredhanson/passport/master/sponsors/descope.svg" width="301"></a><br/>
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 </p>