chore(): rename prepublish commands to prepare

[wbhob]

to comply with https://docs.npmjs.com/misc/scripts#deprecation-note

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[X] Other... Please describe: NPM Scripts

What is the current behavior?

Currently warns on install, since npm prepublish was deprecated. This PR introduces the NPM v6-compliant prepare command.

Issue Number: N/A

What is the new behavior?

Instead of running npm prepublish, run npm prepare

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

[coveralls]

Coverage remained the same at 94.649% when pulling 0bf98c4 on wbhob:npm6-scripts into 8d62307 on nestjs:master.

[kamilmysliwiec]

Thanks 🙂Merged

[lock]

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