docs: update wrapper to log output on error

Author: bendrucker

README.md

@@ -129,9 +129,8 @@ or specify it explicitly as
 - id: tflint
   run: tflint -f compact
 
-- run: echo ${{ steps.tflint.outputs.stdout }}
-- run: echo ${{ steps.tflint.outputs.stderr }}
-- run: echo ${{ steps.tflint.outputs.exitcode }}
+- if: always()
+  run: echo ${{ steps.tflint.outputs.stdout }}
 ```
 
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