fix: as is, output cannot be used (#2)

Signed-off-by: Yoan Blanc <yblanc@edgelab.ch>
Co-authored-by: Vincent Thiery <vjmthiery@gmail.com>

Author: greut

README.md

@@ -18,7 +18,7 @@ In particular:
 
 ```hcl
 module "my_database" {
-  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.1.0"
+  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.1.1"
 
   database = "my-database"
 

outputs.tf

@@ -3,5 +3,5 @@ output "database" {
 }
 
 output "user" {
-  value = mysql_user.this.*.name
+  value = local.user
 }