Update README.md

mmiraldi · Feb 21, 2019 · 02c7c17 · 02c7c17
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 # slack-themes
 Custom CSS for Slack desktop app
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+Most themes are merely tweaks of original CSS by Bryan Keller (https://github.com/widget-).
+See https://github.com/widget-/slack-black-theme for instructions on applying custom CSS to Slack.