Update sponsor URL

Author: gilbarbara

README.md

@@ -62,11 +62,12 @@ export class App extends React.Component {
 > If you need to support legacy browsers you need to include the [scrollingelement](https://github.com/mathiasbynens/document.scrollingElement) polyfill.
 
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+
 Sponsored by
 
-[![Frigade](http://gilbarbara.com/files/frigade-sponsor-v1.png)](https://frigade.com/)
+[![Frigade](http://gilbarbara.com/files/frigade-sponsor-v1.png)](https://frigade.com/?source=joyride)
 
-React Joyride is proud to be sponsored by [Frigade](https://frigade.com/), a developer tool for building better product onboarding: guided tours, getting started checklists, announcements, etc.
+React Joyride is proud to be sponsored by [Frigade](https://frigade.com/?source=joyride), a developer tool for building better product onboarding: guided tours, getting started checklists, announcements, etc.
 
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