Update README.md

README.md

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 <a href="#sponsors" alt="Sponsors on Open Collective"><img src="https://opencollective.com/Kingfisher/sponsors/badge.svg" /></a>
 </p>
 
-Kingfisher is a powerful, pure-Swift library for downloading and caching images from the web. It provides you a chance to use a pure-Swift alternative in your next app.
+Kingfisher is a powerful, pure-Swift library for downloading and caching images from the web. It provides you a chance to use a pure-Swift way to work with remote images in your next app.
 
 ## Features