CHANGELOG.md in benchmark_driver-0.14.22 vs CHANGELOG.md in benchmark_driver-0.15.0

@@ -1,4 +1,13 @@
+# v0.15.0
+
+- Introduce output plugin interface to accept arbitrary `--output-xxx` option
+- Hide `--rbenv` option when `rbenv` command is not available
+
+# v0.14.22
+
+- Fix warnings for keyword arguments in Ruby 2.7
+
 # v0.14.21
 
 - Avoid crashinig on a zero division error in `compare` output
   [#56](https://github.com/benchmark-driver/benchmark-driver/pull/56)