Update checkout action to v4 tag in README.md (#187)

Signed-off-by: Maarten Blokker <maarten.blokker@outlook.com>

Author: maarten-blokker

README.md

@@ -67,7 +67,9 @@ jobs:
           git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
 
       - name: Install Helm
-        uses: azure/setup-helm@v3
+        uses: azure/setup-helm@v4
+          env:
+            GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 
       - name: Run chart-releaser
         uses: helm/chart-releaser-action@v1.6.0