Updating README

Author: mikebroberts

.github/workflows/integration-test.yml

@@ -11,9 +11,6 @@ permissions:
   id-token: write   # Required for OIDC
   contents: read
 
-env:
-  AWS_REGION: us-east-1
-
 jobs:
   integration-test:
     runs-on: ubuntu-latest
@@ -35,12 +32,11 @@ jobs:
       - uses: aws-actions/configure-aws-credentials@v4
         with:
           role-to-assume: arn:aws:iam::397589511426:role/account-wide-resources-GithubActionsRole-1CAIKQPYM5WD3
-          aws-region: ${{ env.AWS_REGION }}
+          aws-region: us-east-1
 
       - run: ./test-harness/deploy-all.sh
 
       - run: ./test-harness/test-all.sh
 
-# TODO - add this back when ready
-#      - if: always()
-#        run: ./test-harness/teardown-all.sh
+      - if: always()
+        run: ./test-harness/teardown-all.sh

MODERNIZATION.md

@@ -10,6 +10,21 @@ For more info on the book itself, see:
 * [O'Reilly's Page](http://shop.oreilly.com/product/0636920178101.do)
 * [The book on Amazon](https://www.amazon.com/Programming-AWS-Lambda-Serverless-Applications/dp/149204105X)
 
+## 2025 updates
+
+This current branch of the code was updated in 2025 to include major updates, related to changes in
+dependencies since the book was published in 2020. These changes include:
+
+* Updating to use Java 21, and to use the AWS Lambda Java 21 runtime
+* Some minor code updates enabled by Java 21 updates vs. Java 8 - mostly just using the `var` keyword
+* Switching to AWS SDK V2, which has syntax changes for accessing all AWS services
+* Testing code updated and modified to use JUnit 5 and Mockito 5
+* Various other other library updates
+
+The original code is available in the [pre-2025-updates tag](https://github.com/symphoniacloud/programming-aws-lambda-book/releases/tag/pre-2025-updates).
+
+## Miscellaneous other changes
+
 For errata and updates, please see [this page](ErrataAndUpdates.md).
 
 We plan on adding blog entries too - keep your eyes peeled on [our blog](https://blog.symphonia.io/) and [our Twitter](https://twitter.com/symphoniacloud).