[manifest] Added at risk warning for theme_color (closes #356) (#368)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/368

-- Commit Summary --

  * Added at risk warning for theme_color (closes #356)

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/manifest/pull/368.patch
https://github.com/w3c/manifest/pull/368.diff

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https://github.com/w3c/manifest/pull/368