[heycam/webidl] Disallow constants to be null (#686)

Closes #448.

No known specs are using constant null, and we discourage adding new constants (with some specs as exceptions), so I think we can safely remove this.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/686

-- Commit Summary --

  * disallow constants to be null

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/heycam/webidl/pull/686.patch
https://github.com/heycam/webidl/pull/686.diff

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