hjkl-buffer 0.3.1

Rope-backed text buffer with cursor and edits. Pre-1.0 churn.
Documentation 
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## Summary

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## Test plan

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- [ ] `cargo fmt --all --check`
- [ ] `cargo clippy --all-targets --all-features -- -D warnings`
- [ ] `cargo test --all-features`
- [ ] Public API change documented in `CHANGELOG.md`

## Related

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