Fixup getSupportInfo for babylon parser prior to 1.16.0

[azz]

This undoes an accidental breaking change where prettier.getSupportInfo('1.0.0') would report supporting the babel parser instead of babylon.

Fixes #5822

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory)
• (If not an internal change) I’ve added my changes to the CHANGELOG.unreleased.md file following the template.
• I’ve read the contributing guidelines.

[azz]

I assume this is correct as it is unreleased?

[azz]

Any idea why I'm getting build failure emails from CircleCI? Is Circle even in use anymore?

[ikatyang]

Circle was removed in #5611, but it seems we forgot to remove their webhooks.

EDIT: I've disabled them.

[azz]

Thanks! Azure pipelines look pretty neat. Are there any issues I should read through to catch up on current state of CI?

[ikatyang]

Azure Pipelines was introduced in #5410 and then tweaked in #5611/#5498, these 3 PRs should include everything about our current CI state. Basically, it's just migrated from Circle/Travis to Azure Pipelines with the same test steps, the docs for Azure Pipelines could be found here.