Update version number to 2.6.1

lib/util/constants.ts

@@ -7,7 +7,7 @@ export const Constants = {
    * @const
    * @type {string}
    */
-  msRestVersion: "2.6.0",
+  msRestVersion: "2.6.1",
 
   /**
    * Specifies HTTP.

package.json

@@ -5,7 +5,7 @@
     "email": "azsdkteam@microsoft.com",
     "url": "https://github.com/Azure/ms-rest-js"
   },
-  "version": "2.6.0",
+  "version": "2.6.1",
   "description": "Isomorphic client Runtime for Typescript/node.js/browser javascript client libraries generated using AutoRest",
   "tags": [
     "isomorphic",