Revert "Add "engines" field to `package.json` for Node 10 or newer (#2603)"
Revert "Add "engines" field to `package.json` for Node 10 or newer (#2603)"

This reverts commit 91a1a4828a0e327510f95420e24cdb945df7c086.

zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli