added ?ref= to module sources

Author: jritsema

examples/open/readme.md

@@ -8,7 +8,7 @@ provider "aws" {
 }
 
 module "elasticache_redis" {
-  source = "github.com/turnerlabs/terraform-aws-elasticache-redis"
+  source = "github.com/turnerlabs/terraform-aws-elasticache-redis?ref=v1.0"
 
   vpc_id = "vpc-d070efb3"
   private_subnet_ids = "subnet-020d8b59,subnet-13f50b64"

readme.md

@@ -6,7 +6,7 @@ A Terraform module that represents an AWS ElastiCache Redis cluster.  Note that
 
 ```terraform
 module "elasticache_redis" {
-  source = "github.com/turnerlabs/terraform-aws-elasticache-redis"
+  source = "github.com/turnerlabs/terraform-aws-elasticache-redis?ref=v1.0"
 
   vpc_id = "vpc-20f74844"
   private_subnet_ids = "subnet-4a887f3c,subnet-76dae35d"