CHANGELOG.md in benchmark_driver-0.4.1 vs CHANGELOG.md in benchmark_driver-0.4.2

@@ -1,4 +1,8 @@
+# v0.4.2
+
+- Exec runner uses `Bundler.with_clean_env`
+
 # v0.4.1
 
 - Increase the number of pasted script in one loop: 50 -> 1000
 - Add `--dir` option to override `__dir__`