chore: Updating README.md to include best practice of pinning versions (#195)

Co-authored-by: Frank Carta <[email protected]>

Author: fcarta29

README.md

@@ -16,6 +16,7 @@ module "eks" {
 
 module "eks_blueprints_addons" {
   source = "aws-ia/eks-blueprints-addons/aws"
+  version = "~> 1.0" #ensure to update this to the latest/desired version
 
   cluster_name      = module.eks.cluster_name
   cluster_endpoint  = module.eks.cluster_endpoint