CHANGELOG.md in benchmark_driver-0.9.0 vs CHANGELOG.md in benchmark_driver-0.9.1

@@ -1,4 +1,9 @@
+# v0.9.1
+
+- Fix memory runner bug that actually doesn't run the benchmarked script
+- Add once runner to test benchmark script in a short time
+
 # 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.