Update CHANGELOG

Author: NekR

CHANGELOG.md

@@ -20,6 +20,10 @@
 * Added basic test and Travis CI
 * `changed` is now default `udpateStrategy` and `hash` strategy is gone. `offline-plugin` now uses webpack's build hashes to apply `change` update strategy even when generate file names are the same. [Issue 6](https://github.com/NekR/offline-plugin/issues/6). More details about change in docs.
 
+### 2.2.0
+
+* Disallow pattern matching in `externals`
+
 ### 2.1.0
 
 * Allow pattern matching in `externals`