Update CHANGELOG to include 2.2.0.

This adds the 2.2.0 CHANGELOG, and removes the related entries under Unreleased.
rack · Feb 9, 2020 · f8fd024 · f8fd024
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commit f8fd024
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file. For info on
 
 ## Unreleased
 
+## [2.2.0] - 2020-02-08
+
 ### SPEC Changes
 
 - `rack.session` request environment entry must respond to `to_hash` and return unfrozen Hash. ([@jeremyevans](https://github.com/jeremyevans))