src: Use prepublishOnly instead of prepublish
src: Use prepublishOnly instead of prepublish

See https://docs.npmjs.com/misc/scripts#prepublish-and-prepare for a
detailed explanation.

Without this change, if there are any vulnerabilities found by `nsp
check`, then users can't install this module, without using
`--ignore-scripts`.
helio-frota/license-reporter,bucharest-gold/license-reporter,helio-frota/license-reporter,lgriffin/license-reporter,bucharest-gold/license-reporter,lgriffin/license-reporter