Bump trim-newlines, ava and xo

Bumps [trim-newlines](https://github.com/sindresorhus/trim-newlines), [ava](https://github.com/avajs/ava) and [xo](https://github.com/xojs/xo). These dependencies needed to be updated together.

Updates `trim-newlines` from 2.0.0 to 4.0.2
- [Release notes](https://github.com/sindresorhus/trim-newlines/releases)
- [Commits](sindresorhus/trim-newlines@v2.0.0...v4.0.2)

Updates `ava` from 2.3.0 to 4.3.1
- [Release notes](https://github.com/avajs/ava/releases)
- [Commits](avajs/ava@v2.3.0...v4.3.1)

Updates `xo` from 0.24.0 to 0.52.0
- [Release notes](https://github.com/xojs/xo/releases)
- [Commits](xojs/xo@v0.24.0...v0.52.0)

---
updated-dependencies:
- dependency-name: trim-newlines
  dependency-type: indirect
- dependency-name: ava
  dependency-type: direct:development
- dependency-name: xo
  dependency-type: direct:development
...

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Author: dependabot[bot]