Update library to support Node 16 (#509)

Author: AndreyIvanov42

azure-pipelines.yml

@@ -13,6 +13,8 @@ strategy:
       versionSpec: '12.x'
     'Node 14': 
       versionSpec: '14.x'
+    'Node 16':
+      versionSpec: '16.x'
 
 steps:
 - task: NodeTool@0

test/package-lock.json

@@ -18,6 +18,6 @@
   "homepage": "https://github.com/Microsoft/azure-devops-node-api#readme",
   "dependencies": {
     "azure-devops-node-api": "file:../_build",
-    "typed-rest-client": "file:../_build"
+    "typed-rest-client": "file:../_build/node_modules/typed-rest-client"
   }
 }

test/package.json

@@ -4,7 +4,7 @@ import nock = require('nock');
 import os = require('os');
 import vsom = require('../../_build/VsoClient');
 import WebApi = require('../../_build/WebApi');
-import * as rm from '../../_build/node_modules/typed-rest-client/RestClient';
+import * as rm from 'typed-rest-client/RestClient';
 import { ApiResourceLocation } from '../../_build/interfaces/common/VsoBaseInterfaces';
 import semver = require('semver');