mix.exs: Add docs/Clients.md to docs.extras

[ci skip]

mix.exs

@@ -21,7 +21,7 @@ defmodule Pleroma.Mixfile do
       homepage_url: "https://pleroma.social/",
       docs: [
         logo: "priv/static/static/logo.png",
-        extras: ["README.md", "docs/config.md", "docs/Pleroma-API.md", "docs/Admin-API.md"],
+        extras: ["README.md", "docs/Admin-API.md", "docs/Clients.md", "docs/config.md", "docs/Pleroma-API.md"],
         main: "readme",
         output: "priv/static/doc"
       ]