docs: fix incorrect grammar in README (#4422)

(cherry picked from commit e81618d)

Author: osBins

README.md

@@ -98,7 +98,7 @@ Yarn is a modern package manager split into various packages. Its novel architec
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-      <b><a href="https://www.cloudflare.com/">Cloudflare</a></b> has also been an historical partner. While we don't directly mirror the npm registry anymore, they still power our website to make its delivery as fast as possible.
+      <b><a href="https://www.cloudflare.com/">Cloudflare</a></b> has also been a historical partner. While we don't directly mirror the npm registry anymore, they still power our website to make its delivery as fast as possible.
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