Update ava to version 0.9.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

ava just published its new version 0.9.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of ava – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 123 commits .

• 974ab6f 0.9.0
• 5e6327d Fix plan count in api test.
• 96930e3 Merge pull request #378 from ariporad/recursive
• 72e87d9 Deeply recurse directories.
• fc3b969 Better test prefixes
• 5aeb270 Merge pull request #380 from sindresorhus/power-assert-in-mini
• e30685f display power-assert output in mini reporter
• 437e88f drop lgtm.co
• b0e508a Merge pull request #375 from ariporad/rename-babel.js
• 0729997 Rename lib/babel.js to lib/test-worker.js
• 7e13552 Merge pull request #371 from sindresorhus/internal-error
• ac468d1 use AvaError for internal errors
• 8346d35 link to the French translation of the docs
• 945dbea Merge pull request #354 from sindresorhus/fix-error-stacks
• b79fdfd Merge pull request #359 from sindresorhus/mini-reporter

There are 123 commits in total. See the full diff.

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