CHANGELOG.md in benchmark_driver-0.8.6 vs CHANGELOG.md in benchmark_driver-0.9.0

@@ -1,4 +1,13 @@
+# v0.9.0
+
+- The concept of runner is renewed
+  - Now it's for specifying metrics like ips, time, memory usage
+  - Old runners (:call and :eval) are no longer supported. :exec only.
+     - So Ruby interface can't take Proc
+  - YAML can have arbitrary format depending on the runner
+- `--compare` option is dropped and changed to `--output compare`
+
 # v0.8.6
 
 - Automatically require `benchmark/output/foo` when `-o foo` is specified
 
 # v0.8.5