CHANGELOG.md in benchmark_driver-0.15.9 vs CHANGELOG.md in benchmark_driver-0.15.10

@@ -1,4 +1,8 @@
+# v0.15.10
+
+- Right-justify calculated results in `markdown` output
+
 # v0.15.9
 
 - Prefer an exact match in RVM version selection
 - Fix a negative duration crash in `ips`, `time` and `once` runners
 - Fix bugs in old TruffleRuby not supporting `keyword_init` of Struct