Removing unnecessary spread plugin proposal since it's in @babel@7

[assuncaocharles]

Related to the issue #5310 that's a correct observation since "@babel/core": "7.1.0" is already a dependency make this plugin unnecessary.

https://babeljs.io/blog/2018/08/27/7.0.0#tc39-proposals-https-githubcom-tc39-proposals-support

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[assuncaocharles]

I see that trevis is failing to run e2e-installs.sh, what locally runs just fine. Any idea what should be done here?

[Timer]

We should probably add a E2E test with the old regression test to make sure this doesn't break again.

[Timer]

This behavior still seems buggy, see unreleased patch to fix these interactions: babel/babel#8793

[ianschmitz]

This behavior still seems buggy, see unreleased patch to fix these interactions: babel/babel#8793

Looks like this was released as part of v7.1.3

[Timer]

Unfortunately, I still don't trust that this works correctly. There's zero harm in including this plugin to be safe, so let's leave it for now.

Thanks for your contribution!