build(zone.js): update changelog of zone.js

[JiaLiPassion]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• 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
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the new behavior?

update the changelog pf zone.js

Does this PR introduce a breaking change?

• Yes
• No

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[JiaLiPassion]

@gkalpak , I updated the PR, update the gulp file to make sure the version is output correctly (zone version instead of angular version), also handle the feedback you give. Thanks!

[googlebot]

CLAs look good, thanks!

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[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

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[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

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