fix(doc): fix link to Cypress.io favicon in README (#5241)

Author: jennifer-shehane

README.md

@@ -187,7 +187,7 @@ Crossbrowser testing sponsored by [Saucelabs](https://saucelabs.com/)
 [<img src="https://saucelabs.com/content/images/circle-logo@2x.png" alt="Saucelabs" width="31" height="31">](https://saucelabs.com/)
 
 End-to-end testing sponsored by [Cypress](https://www.cypress.io/)
-[<img src="https://www.cypress.io/img/favicon.ico" alt="Cypress" width="31" height="31">](https://www.cypress.io/)
+[<img src="https://raw.githubusercontent.com/cypress-io/cypress-icons/master/src/favicon/favicon.ico" alt="Cypress" width="31" height="31">](https://www.cypress.io/)
 
 ### License