update CHANGELOG
document bugfix
## 0.10.4-dev
- add new `examples/umami` for load testing Drupal 9 demo install profile
- replace TermLogger with SimpleLogger for increased logging flexibility
- - Add initial OCI Dockerfile for container-based workflows
+ - add initial OCI Dockerfile for container-based workflows
+ - use checked subtraction when calculating drift duration to prevent panic
## 0.10.3 Oct 14, 2020
- fixup sticky redirect tests to properly test functionality
