Bump backtrace from 0.3.26 to 0.3.28 (#86)
Bump backtrace from 0.3.26 to 0.3.28 (#86)

Bumps [backtrace](https://github.com/rust-lang/backtrace-rs) from 0.3.26 to 0.3.28.
- [Release notes](https://github.com/rust-lang/backtrace-rs/releases)
- [Commits](https://github.com/rust-lang/backtrace-rs/compare/0.3.26...0.3.28)
alex/csv-sql