docs(readme): add rc section and fixed source versions

Author: Orkuncakilkaya

README.md

@@ -52,7 +52,8 @@ terraform {
 }
 
 module "fingerprint_fastly_vcl_integration" {
-  source                     = "github.com/fingerprintjs/temp-fastly-vcl-terraform"
+  source                     = "fingerprintjs/vcl-fingerprint-proxy-integration/fastly"
+  version                    = "~> 1.0"
   fastly_api_token           = "FASTLY_API_TOKEN"
   proxy_secret               = "FINGERPRINT_PROXY_SECRET"
   integration_path           = "INTEGRATION_PATH"
@@ -81,6 +82,32 @@ You can see the full list of the Terraform module's variables below:
 | `asset_version`                  | GitHub release version used for the VCL asset                                                                                                                                                 | Optional | `"latest"`                                     |
 | `manage_fastly_dictionary_items` | Manage Fastly Dictionary items via terraform, see [Fastly documentation](https://registry.terraform.io/providers/fastly/fastly/latest/docs/resources/service_dictionary_items#manage_items-1) | Optional | `false`                                        |
 
+### Using Release Candidates (Optional)
+
+To use a release candidate version of the module, specify it explicitly in the version field:
+
+```terraform
+module "fingerprint_fastly_vcl_integration" {
+   source  = "fingerprintjs/vcl-fingerprint-proxy-integration/fastly"
+   version = "1.0.0-rc.1"
+   # Other module inputs
+}
+```
+
+Alternatively, you can point directly to the GitHub repository and use a branch (e.g., `rc`) via the ref parameter. 
+This ensures you're always using the latest commit from that branch:
+
+```terraform
+module "fingerprint_fastly_vcl_integration" {
+   source = "github.com/fingerprintjs/terraform-fastly-vcl-fingerprint-proxy-integration?ref=rc"
+   # Other module inputs
+}
+```
+
+> [!WARNING]   
+> Using a GitHub source with `ref` disables version locking and may result in unexpected changes when the branch is updated. 
+> Recommended for development or testing only.
+
 ## 2. Deploy your Terraform changes
 
 1. Initialize the Terraform module: