Bump prosemirror-schema-list from 1.4.1 to 1.5.0

Bumps [prosemirror-schema-list](https://github.com/prosemirror/prosemirror-schema-list) from 1.4.1 to 1.5.0.
- [Changelog](https://github.com/ProseMirror/prosemirror-schema-list/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prosemirror/prosemirror-schema-list/compare/1.4.1...1.5.0

)

---
updated-dependencies:
- dependency-name: prosemirror-schema-list
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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