Bump dot-prop, conventional-changelog-angular and conventional-change…

…log-writer

Bumps [dot-prop](https://github.com/sindresorhus/dot-prop), [conventional-changelog-angular](https://github.com/conventional-changelog/conventional-changelog) and [conventional-changelog-writer](https://github.com/conventional-changelog/conventional-changelog). These dependencies needed to be updated together.

Updates `dot-prop` from 4.2.0 to 4.2.1
- [Release notes](https://github.com/sindresorhus/dot-prop/releases)
- [Commits](sindresorhus/dot-prop@v4.2.0...v4.2.1)

Updates `conventional-changelog-angular` from 5.0.10 to 5.0.13
- [Release notes](https://github.com/conventional-changelog/conventional-changelog/releases)
- [Changelog](https://github.com/conventional-changelog/conventional-changelog/blob/master/.release-please-manifest.json)
- [Commits](https://github.com/conventional-changelog/conventional-changelog/compare/conventional-changelog-angular@5.0.10...conventional-changelog-angular-v5.0.13)

Updates `conventional-changelog-writer` from 4.0.16 to 4.1.0
- [Release notes](https://github.com/conventional-changelog/conventional-changelog/releases)
- [Changelog](https://github.com/conventional-changelog/conventional-changelog/blob/master/.release-please-manifest.json)
- [Commits](https://github.com/conventional-changelog/conventional-changelog/compare/conventional-changelog-writer@4.0.16...conventional-changelog-writer-v4.1.0)

---
updated-dependencies:
- dependency-name: dot-prop
  dependency-type: indirect
- dependency-name: conventional-changelog-angular
  dependency-type: indirect
- dependency-name: conventional-changelog-writer
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>