finagle: Add XiaoMi to ADOPTERS.md
finagle: Add XiaoMi to ADOPTERS.md

Summary: Signed-off-by: Bryce Anderson <banderson@twitter.com>

JIRA Issues: CSL-5432

Differential Revision: https://phabricator.twitter.biz/D105736

luciferous/finagle,luciferous/finagle,twitter/finagle,luciferous/finagle,twitter/finagle,mkhq/finagle,luciferous/finagle,mkhq/finagle,mkhq/finagle,mkhq/finagle,mkhq/finagle,twitter/finagle,twitter/finagle,luciferous/finagle,twitter/finagle,mkhq/finagle,luciferous/finagle