feat: added a blank line in readme

Author: oneanupam

tf-variables/README.md

@@ -23,4 +23,4 @@ To execute the terraform code, go to command prompt and then run the following c
 -   [Optional] `terraform destroy -auto-approve`
 
 ## References
-- https://developer.hashicorp.com/terraform/language/values/variables
+- https://developer.hashicorp.com/terraform/language/values/variables