[doc] add sponsors section to readme

README.md

@@ -14,6 +14,27 @@ With Colly you can easily extract structured data from websites, which can be us
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fgocolly%2Fcolly.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fgocolly%2Fcolly?ref=badge_shield)
 [![Twitter URL](https://img.shields.io/badge/twitter-follow-green.svg)](https://twitter.com/gocolly)
 
+
+------
+
+
+## Sponsors
+
+
+<a href="https://scrapfly.io/?utm_source=Github&utm_medium=repo&utm_campaign=colly" target="_blank"><img src="assets/scrapfly.png" alt="Scrapfly.io" width="149"></a>
+
+[Scrapfly](https://scrapfly.io/?utm_source=Github&utm_medium=repo&utm_campaign=colly)
+is an enterprise-grade solution providing Web Scraping API that aims to simplify the
+scraping process by managing everything: real browser rendering, rotating proxies, and
+fingerprints (TLS, HTTP, browser) to bypass all major anti-bots. Scrapfly also unlocks the
+observability by providing an analytical dashboard and measuring the success rate/block
+rate in detail.
+
+
+------
+
+
+
 ## Features
 
 -   Clean API