build: update to node 16 and npm 8

[manbearwiz]

I noticed a lot of packages in this repo are very out of date and I wanted to help update them, as I still see this benchmark cited when reviewing new hardware. I think this wll be a good first step to facilitate future updates. I elected to update to node 16 and npm 8 to minimize the number of changes made at once.

I took the following steps.

• use npm 8 to upgrade lockfile to v2
• update upath 1.0.4 > 1.2.0 to remove requirement on node: '>=4 <=9'
• update .nvmrc file to 16
• update travis build to use node versions that ship with npm 7 and 8 (is travis still setup?)
• ran install, build, test, and cli with node 16