v0.15.0

Features:

• wotan test now validates test configurations
• Performance improvements using recently added Node.js file system features
• Improved caching of directory entries
• Work around breaking changes in TypeScript API regarding project references
• --fix now merges replacements of a single fix instead of throwing an error
• no-useless-spread: added check for JSX spread attributes

Bugfixes:

• no-useless-initializer: removed unreliable fix for object destructuring
• no-useless-initializer: fixed false positive in destructuring when property is a type parameter or conditional type