nit: restore old Joyent copyright attribution

[brody4hire]

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As they discussed in nodejs/TSC#174 the Joyent copyright attribution should never have been removed from the source files and they restored it in nodejs/node#10155.

[addaleax]

they restored it in nodejs/node#10155.

Just to be clear, that PR is part of Ayo at this point, so it might be nice if you could be more specific about what we should do?

[brody4hire]

My bad, apologies!