Add return statement to example

As someone not familiar with javascript I was banging my head against the wall for an embarrassingly long time trying to figure out why this wasn't working.

README.md

@@ -102,7 +102,7 @@ By default, requests made with the `github` instance will not be retried. You ca
     result-encoding: string
     retries: 3
     script: |
-      github.rest.issues.get({
+      return github.rest.issues.get({
         issue_number: context.issue.number,
         owner: context.repo.owner,
         repo: context.repo.repo,
@@ -121,7 +121,7 @@ You can also configure which status codes should be exempt from retries via the
     retries: 3
     retry-exempt-status-codes: 400,401
     script: |
-      github.rest.issues.get({
+      return github.rest.issues.get({
         issue_number: context.issue.number,
         owner: context.repo.owner,
         repo: context.repo.repo,