Update module description

Use the term "access" rather than "read" since writing may be allowed
depending on the value of var.read_only.

README.md

@@ -2,10 +2,10 @@
 
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-This is a Terraform module for creating an IAM role and policy that can
-read Terraform state objects from a specified S3 bucket.  It also creates
-a policy that allows the role to be assumed from a specified list of AWS
-account IDs.
+This is a Terraform module for creating an IAM role and policy that
+can access Terraform state objects from a specified S3 bucket.  It
+also creates a policy that allows the role to be assumed from a
+specified list of AWS account IDs.
 
 ## Usage ##