[heycam/webidl] Disallow underscore-and-hyphen only identifiers (#633)

This works for #632.
The previous regular expression accepts strange tokens, i.e. `_-` or `-123`, as identifier tokens. The new expression does not accept them.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/633

-- Commit Summary --

  * Disallow underscore or hyphen only identifiers

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/633.patch
https://github.com/heycam/webidl/pull/633.diff

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