Update README.md

README.md

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 Record and inspect network requests and logs right from your iOS app using Pulse Console. Share and view logs in Pulse macOS app. Logs are recorded locally and never leave your device. Learn more at [**kean.blog/pulse**](https://kean.blog/pulse/home) 🔗.
 
-<a href="https://testflight.apple.com/join/B2p3vcwl">
-<img height=60 src="https://user-images.githubusercontent.com/1567433/108601031-66989200-7368-11eb-92dd-f5da70a3c4f6.png">
-</a>
+**Pulse** is free to use, but it's strongly encouraged to sponsor it (pay as much as you want).
 
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