[tagpr] update CHANGELOG.md

Author: github-actions[bot]

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [v0.7.3](https://github.com/yuuki/tcpulse/compare/v0.7.2...v0.7.3) - 2025-06-08
 - refactor: replace cobra subcommands with pflag/viper flags by @yuuki in https://github.com/yuuki/tcpulse/pull/28
+- refactor: consolidate utility functions and add comprehensive main.go tests by @yuuki in https://github.com/yuuki/tcpulse/pull/29
 
 ## [v0.7.2](https://github.com/yuuki/tcpulse/compare/v0.7.1...v0.7.2) - 2025-06-08
 - Add JSON Lines output format for measurement results by @yuuki in https://github.com/yuuki/tcpulse/pull/25