Added ability to use additional optimizers

[scorgn]

To add the ability to use additional optimizers without editing the core loader, I have added the option additionalPlugins to the loader options. Using this, a user can define an additional imagemin plugin to use, along with it's options, and the loader will utilize that optimizer as well (as long as it is installed as a node module).

[tcoopman]

sorry for the late review. Can you add a test where you add an additional optimizer?

[anikethsaha]

I think this is good.
Yeah, tests are required.
@tcoopman I guess you can add the tests in this PR.
or else I will fork @ShawnCorrigan 's branch and will add tests and submit a follow-up PR for the tests

[tcoopman]

A follow-up PR with tests would be ok.

[anikethsaha]

aah...I cant fork his repo and keeping my existing fork.
And even if I am forking his repo, I guess he is not active in GitHub so it might not get merge there.

I guess you can merge this and I will add tests

[scorgn]

I am active enough, I will accept any PRs towards my repo. I just never had time to write tests for this.

[anikethsaha]

I am active enough, I will accept any PRs towards my repo. I just never had time to write tests for this.

Ohh...I saw your GH contribution graph and thought of that. Nevermind. Will submit a PR in your fork soon

[scorgn]

Sounds good! I'll keep an eye out for a PR. I am only contributing to private repos right now, but I do want to get back into open source development.

[anikethsaha]

Sounds good! I'll keep an eye out for a PR. I am only contributing to private repos right now, but I do want to get back into open source development.

Great to hear that 👍

[tcoopman]

Can the conflicts be resolved?

[anikethsaha]

@ShawnCorrigan after rebasing , you need to update the schema.json as well to add this new configuration property.

[scorgn]

Okay I will get to this tonight after work

[anikethsaha]

Cc @ShawnCorrigan