prepare v0.3.0

Signed-off-by: Yoan Blanc <yblanc@edgelab.ch>

Author: greut

README.md

@@ -17,7 +17,7 @@ In particular:
 
 ```hcl
 module "my_database" {
-  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.2.3"
+  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.3.0"
 
   database = "my-database"
 
@@ -27,7 +27,7 @@ module "my_database" {
   # Optional user password. Not required when using Vault roles
   plaintext_password = "a very hard to guess password"
 
-  # Default values are utf8mb4 and utf8mb4_unicode_ci
+  # The default values
   default_character_set = "utf8"
   default_collation     = "utf8_unicode_ci"
 
@@ -42,7 +42,7 @@ You can provide extra permissions for `all-privileges` or `read-only` roles with
 
 ```hcl
 module "my_database" {
-  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.2.3"
+  source = "git@github.com:edgelaboratories/terraform-mysql-db?ref=v0.3.0"
 
   database = "my-database"
 

variables.tf

@@ -15,11 +15,11 @@ variable "plaintext_password" {
 }
 
 variable "default_character_set" {
-  default = "utf8mb4"
+  default = "utf8"
 }
 
 variable "default_collation" {
-  default = "utf8mb4_unicode_ci"
+  default = "utf8_unicode_ci"
 }
 
 variable "vault_backend_path" {