CHANGELOG.md in benchmark_driver-0.14.20 vs CHANGELOG.md in benchmark_driver-0.14.21

@@ -1,4 +1,9 @@
+# v0.14.21
+
+- Avoid crashinig on a zero division error in `compare` output
+  [#56](https://github.com/benchmark-driver/benchmark-driver/pull/56)
+
 # v0.14.20
 
 - Add `block` runner to automatically wrap a Ruby block in script for benchmarking MJIT
 
 # v0.14.19