fix: Add missing equals sign (#116)

Author: dlaz

modules/authorization/README.md

@@ -18,7 +18,7 @@ Example:
 ```hcl
 module "dataset" {
   source = "terraform-google-modules/bigquery/google"
-  version "~> 4.1"
+  version = "~> 4.1"
 
   dataset_id                  = "example_dataset"
   dataset_name                = "example_dataset"