[WICG/webcomponents] Update CSS modules explainer to include addition of import assertions (#931)

Update the CSS modules explainer to cover the use of [import assertions](https://github.com/tc39/proposal-import-assertions) to prevent unexpected MIME type switches.
You can view, comment on, or merge this pull request online at:

  https://github.com/WICG/webcomponents/pull/931

-- Commit Summary --

  * Update CSS modules explainer to include addition of import assertions

-- File Changes --

    M proposals/css-modules-v1-explainer.md (17)

-- Patch Links --

https://github.com/WICG/webcomponents/pull/931.patch
https://github.com/WICG/webcomponents/pull/931.diff

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