add smooth-scrollbar v6.0.4 with npm autoupdate config

[pvnr0082t]

PR for #7823
@x09326 Please help me review this pull request, thank you.

Checklist for Pull request or lib adding request issue follows the conventions.

Note that if you are using a distribution purpose repository/package, please also provide the url and other related info like popularity of the source code repo/package.

Profile of the lib

• Git repository (required): https://github.com/idiotWu/smooth-scrollbar
• Official website (optional, not the repository): http://idiotwu.github.io/smooth-scrollbar/
• NPM package url (optional): https://www.npmjs.com/package/smooth-scrollbar
• GitHub / Bitbucket popularity (required):
  • Count of stars: 139
  • Count of watchers: 4
  • Count of forks: 9
• NPM download stats (optional):
  • Downloads in the last day: 15
  • Downloads in the last week: 1162
  • Downloads in the last month: 4622

Essential checklist

• I'm the author of this library
  • I would like to add link to the page of this library on CDNJS on website / readme
• This lib was not found on cdnjs repo
• No already exist / duplicated issue and PR
• The lib has notable popularity
  • More than 100 [Stars / Watchers / Forks] on [GitHub / Bitbucket]
  • More than 500 downloads stats per month on npm registry
• Project has public repository on famous online hosting platform (or been hosted on npm)

Auto-update checklist

• Has valid tags for each versions (for git auto-update)
• Auto-update setup
• Auto-update target/source is valid.
• Auto-update filemap is correct.

Git commit checklist

• The first line of commit message is less then 50 chars, be clean and clear, easy to understand.
• The parent of the commit(s) in the PR is not old than 3 days.
• Pull request is sending from a non-master branch with meaningful name.
• Separate unrelated changes into different commits.
• Use rebase to squash/fixup dummy/unnecessary commits into only one commit.
• Close corresponding issue in commit message
• Mention related issue(s), people in commit message, comment.

close #7823, cc @idiotWu

[pvnr0082t]

@x09326 The latest version updated to v6.0.1. Please help me review it. Thank you.

[x09326]

I think we need the origin file (src/smooth_scrollbar.js).

@PeterDaveHello we need that right?
Do we need to ask the author to modify the name of minified files?

[idiotWu]

Hmm...actually I'm thinking that if it's necessary to publish an unminified version of compiled source. Since the project is written in es6 and pre-compiled with babel, it would be hard to debug without souce maps.

[PeterDaveHello]

@idiotWu so what about just host the dist folder?

[idiotWu]

@PeterDaveHello that would be fine.

[PeterDaveHello]

@idiotWu thanks!
@x09326 so we just leave it alone.

[pvnr0082t]

@x09326 The latest version is v6.0.4. Please help me review again, thank you.

[x09326]

@PeterDaveHello
I think this PR is okay, please help me review it, thanks.