Update ava to version 0.15.2 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

ava just published its new version 0.15.2, 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 97 commits .

• 19625c9 0.15.2
• 94ef905 use currently-unhandled
• 63b4782 0.15.1
• ab3418f Prevent suppression of defaults in ava-files (#878)
• abd8bd2 minor tweaks
• c9c00d6 0.15.0
• 7486dcb add test.failing and add cb to test.serial (#866)
• 77b55e5 Move images to media folder.
• 463dbd4 bump update-notifier. (#869)
• bc11e08 Fix AppVeyor Badge (leave it pointing to Sindre's account).
• 6f83264 document always hook with fail fast flag (#858)
• 1d51231 fix warning message
• a499523 Drop unusedsilentoption fromlib/fork.js. (#864)
• a543b9f revert npm link fix. (#859)
• 0ef6dc4 Fix "Test files must be run with the AVA CLI" warning. (#862)

There are 97 commits in total. See the full diff.

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