Update CHANGELOG.md

Author: mfriesen

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Lambda Runtime Graalvm Releases #
 
+### Version 2.2.2 (March 7, 2021)
+- [Pull 9](https://github.com/formkiq/lambda-runtime-graalvm/pull/9)
+ * Lambda handler class is instantiated for each request
+ 
 ### Version 2.2.1 (Jan 21, 2020)
 - [Pull 7](https://github.com/formkiq/lambda-runtime-graalvm/pull/7)
  * renamed _X_AMZN_TRACE_ID to com.amazonaws.xray.traceHeader