What's Changed
* Bump tornado from 6.4.1 to 6.4.2 by dependabot in https://github.com/shyaginuma/casual_inference/pull/62
* small fixes to improve usability by shyaginuma in https://github.com/shyaginuma/casual_inference/pull/63
**Full Changelog**: https://github.com/shyaginuma/casual_inference/compare/v0.7.0...v0.7.1