Update README.md

Author: slorber

README.md

@@ -22,6 +22,9 @@ Don't expect it to grow in size, it is **feature complete**:
 - Can mutate state after fetch
 - Returned callbacks are stable
 
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 ## Small size
 
 - Way smaller than popular alternatives
@@ -37,6 +40,16 @@ Don't expect it to grow in size, it is **feature complete**:
 | **Use-HTTP**         | [![](https://img.shields.io/bundlephobia/min/use-http.svg)](https://bundlephobia.com/package/use-http)                 | [![](https://img.shields.io/bundlephobia/minzip/use-http.svg)](https://bundlephobia.com/package/use-http)                 |
 | **Rest-Hooks**       | [![](https://img.shields.io/bundlephobia/min/rest-hooks.svg)](https://bundlephobia.com/package/rest-hooks)             | [![](https://img.shields.io/bundlephobia/minzip/rest-hooks.svg)](https://bundlephobia.com/package/rest-hooks)             |
 
+--- 
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+# Sponsor
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+**[ThisWeekInReact.com](https://thisweekinreact.com)**: the best newsletter to stay up-to-date with the React ecosystem:
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+[![ThisWeekInReact.com banner](https://user-images.githubusercontent.com/749374/136185889-ebdb67cd-ec78-4655-b88b-79a6c134acd2.png)](https://thisweekinreact.com)
+
+---
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 ## Things we don't support (by design):
 
 - stale-while-revalidate