Rename "epoch" to "edition" #5214
Description
In rust repo, we've started renaming all the references of "epoch" to "edition". At the request of @Manishearth, let's make any needed parallel changes here in the cargo project.
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In rust repo, we've started renaming all the references of "epoch" to "edition". At the request of @Manishearth, let's make any needed parallel changes here in the cargo project.