CHANGELOG.md in format_parser-2.0.0 vs CHANGELOG.md in format_parser-2.1.0

@@ -1,4 +1,9 @@
+## 2.1.0
+* Require minumum 2.6 ruby version.
+* Bring back 2.6 to test matrix, we have jruby there which is still compatible with 2.6
+* Drop `ks` dependency.
+
 ## 2.0.0
 * Drop explicit support for Ruby `<2.7`.
 * Drop faraday dependencies.
 * Loosen version constraints on other dependencies.
 * Update measurometer metrics for consistency and clarity.