v6.0.0-alpha.1

Fixed

• Fix prop-types crash when accessing constructor on props (#654)
• Fix jsx-filename-extension to not check filenames on text input (#662 @ljharb)
• Fix no-comment-textnodes incorrectly catching urls (#664 @petersendidit)

Breaking

• Add ESLint as peerDependency (#657 @jokeyrhyme)
• Add Node.js 0.10 as minimum required version (#657 @jokeyrhyme)

Changed

• Update dependencies
• Update Travis CI and AppVeyor CI configurations (@ljharb)