Release: v2.1.0 (#351)

## What's Changed
* Update README and CI to use latest version by @sethvargo in
#342
* docs: replace old parameter on example code by @nasustim in
#346
* Stream output when debug is enabled by @sethvargo in
#348
* Update deps by @sethvargo in
#350

## New Contributors
* @nasustim made their first contribution in
#346

**Full Changelog**:
v2.0.0...81b21e6

Author: google-github-actions-bot

dist/index.js

@@ -1,6 +1,6 @@
 {
   "name": "deploy-appengine",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "Github Action: Deploy to Google App Engine",
   "main": "dist/index.js",
   "scripts": {