[heycam/webidl] Meta: point out commit instructions (#634)

And make various other changes to modernize the README.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/634

-- Commit Summary --

  * Meta: point out commit instructions

-- File Changes --

    M README.md (13)

-- Patch Links --

https://github.com/heycam/webidl/pull/634.patch
https://github.com/heycam/webidl/pull/634.diff

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https://github.com/heycam/webidl/pull/634