[heycam/webidl] Use Oxford comma (#743)

• From: Anne van Kesteren <notifications@github.com>
• Date: Wed, 26 Jun 2019 04:44:49 -0700
• To: heycam/webidl <webidl@noreply.github.com>
• Cc: Subscribed <subscribed@noreply.github.com>
• Message-ID: <heycam/webidl/issues/743@github.com>

I noticed in #742 that we might not.

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Received on Wednesday, 26 June 2019 11:45:11 UTC