chore: update README.md

Author: actions-user

README.md

@@ -185,6 +185,11 @@ See [Terraform types and values](https://www.terraform.io/docs/configuration/exp
 ```text
 Available targets:
 
+  help                                Help screen
+  help/all                            Display help for all targets
+  help/short                          This help short screen
+  lint                                Lint terraform code
+
 ```
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