Upgrade rollup

[paulmelnikow]

This is emitting a couple warnings:

(!) cleaner plugin: The ongenerate hook used by plugin cleaner is deprecated. The generateBundle hook should be used instead.
(!) rollup-plugin-cpy plugin: The onwrite hook used by plugin rollup-plugin-cpy is deprecated. The generateBundle hook should be used instead.

I've reported them:

• Update for Rollup v1 saf33r/rollup-plugin-cleaner#5
• Update for Rollup v1 shrynx/rollup-plugin-cpy#4

They don't seem to be blocking.

[vercel]

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