add options.silent support for Instance increment and decrement.

[iyuq]

Thanks for wanting to fix something on Sequelize - we already love you long time! Please delete this text and fill in the template below. If unsure about something, just do as best as you're able.

If your PR only contains changes to documentation, you may skip the template below.

Pull Request check-list

Please make sure to review and check all of these items:

• [√ ] Does npm run test or npm run test-DIALECT pass with this change (including linting)?
• Does your issue contain a link to existing issue (Closes #[issue]) or a description of the issue you are solving?
• [√] Have you added new tests to prevent regressions?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Have you added an entry under Future in the changelog?

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

add options.silent support for Instance increment and decrement method, so you can use

user.increment('count', {silent: true} 

to prevent update the updatedAt field.

But I got a error run npm run docs, so I don't update the docs, please help me do this.

[mention-bot]

@iyuq, thanks for your PR! By analyzing the history of the files in this pull request, we identified @BridgeAR, @mbroadst and @mickhansen to be potential reviewers.

[iyuq]

@mention-bot you are welcome!

[codecov-io]

Current coverage is 93.84% (diff: 100%)

Merging #6793 into v3 will not change coverage

Powered by Codecov. Last update 15ee1c1...9f40ffb

[sushantdhiman]

Need this for master as well @iyuq

[janmeier]

Should be pretty easy to just cherry pick this to master

[iyuq]

@felixfbecker okay, I will add a pull request for master latter. So this PR is acceptable?

[iyuq]

I add this for master as well, see PR#6795, @felixfbecker

[janmeier]

Thanks a lot @iyuq ! :)