Update version to 1.2.1

package.json

@@ -5,7 +5,7 @@
     "email": "azsdkteam@microsoft.com",
     "url": "https://github.com/Azure/ms-rest-azure-js"
   },
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Isomorphic Azure client runtime for Typescript/node.js/browser javascript client libraries generated using AutoRest",
   "tags": [
     "isomorphic",