Update dependencies and Travis metadata

[anko]

What / Why

Sweeping floors, dusting surfaces, patching vulns. :hammer_and_wrench:

• Old tap pulls in deps that have vulnerabilities like https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7598 (I had an npm audit warning about this, and tracked it down to here...)
• A bunch of packages on npm depend on this one. Weekly downloads still increasing. https://www.npmjs.com/package/wrappy
• Having Travis just target whatever is newest Node + LTS should ease maintenance burden.

References

n/a

[erfantkerfan]

@isaacs