Update README.md

I wasted a few minutes before I realised I was using an old version of this action. Update the readme to point at the latest version

Author: paddyobrien

README.md

@@ -16,7 +16,7 @@ This repo contains the github actions for installing [AWS Copilot cli](https://g
         with:
           role-to-assume: arn:aws:iam::111111111111:role/my-github-actions-role-test
           aws-region: us-east-1
-      - uses: ksivamuthu/[email protected].1
+      - uses: ksivamuthu/[email protected].7
         with:
           command: install
       - run: |
@@ -35,7 +35,7 @@ This repo contains the github actions for installing [AWS Copilot cli](https://g
         with:
           role-to-assume: arn:aws:iam::111111111111:role/my-github-actions-role-test
           aws-region: us-east-1
-      - uses: ksivamuthu/[email protected].1
+      - uses: ksivamuthu/[email protected].7
         with:
           command: deploy
           app: your-awesome-app
@@ -74,4 +74,4 @@ In the with attribute, the tag value can be used to define the tag image name
           app: your-awesome-app
           env: prod
           tag: image-name
-```
+```