CHANGELOG.md in benchmark_driver-0.10.12 vs CHANGELOG.md in benchmark_driver-0.10.13

@@ -1,4 +1,9 @@
+# v0.10.13
+
+- Add `x.output` to specify output plugin to Ruby interface
+  - You can still use `Benchmark.driver(output: xxx)` form too
+
 # v0.10.12
 
 - Fix some typo in help
 - Add dynamic require for convenience to implement output plugins