update changelog and version number

Changelog.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 2.2.2 - UNRELEASED
+- Fix abort signal event handler memory leak (PR [#425](https://github.com/Azure/ms-rest-js/pull/425))
+
 ## 2.2.1 - 2021-02-05
 - Fix issue of `SystemErrorRetryPolicy` didn't retry on errors (Issue [#412](https://github.com/Azure/ms-rest-js/issues/412))
 - `ThrottlingRetryPolicy` now keep retrying on 429 responses up to a limit. Fixes (Issue [#394](https://github.com/Azure/ms-rest-js/issues/394))

lib/util/constants.ts

@@ -7,7 +7,7 @@ export const Constants = {
    * @const
    * @type {string}
    */
-  msRestVersion: "2.2.1",
+  msRestVersion: "2.2.2",
 
   /**
    * Specifies HTTP.

package.json

@@ -5,7 +5,7 @@
     "email": "azsdkteam@microsoft.com",
     "url": "https://github.com/Azure/ms-rest-js"
   },
-  "version": "2.2.1",
+  "version": "2.2.2",
   "description": "Isomorphic client Runtime for Typescript/node.js/browser javascript client libraries generated using AutoRest",
   "tags": [
     "isomorphic",