`memtrace install` needs sudo, but CLI hint does not mention it

[MartinJepsen]

Starting memtrace when an update is available gives this:

[memtrace] Update available: 1.1.1 → 1.1.3
           Run: memtrace install   (upgrades + can chain commands, e.g. `memtrace install start`)

However, without sudo memtrace install, I get this:

Proceed with these changes? [y/N] y
memtrace: fetching latest from npm registry…
npm error code EACCES
npm error syscall rename
npm error path /usr/lib/node_modules/memtrace
npm error dest /usr/lib/node_modules/.memtrace-9mG6rTOt
npm error errno -13
npm error Error: EACCES: permission denied, rename '/usr/lib/node_modules/memtrace' -> '/usr/lib/node_modules/.memtrace-9mG6rTOt'

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