fix(template): add a new comment

Author: hanks

configs/default.go

@@ -18,7 +18,11 @@ var VarConfName = "vars.yml"
 var DstFile = "variables.tf"
 
 // VarTemplate is the template object to define 'variable block' in 'variables.tf'
-var VarTemplate = template.Must(template.New("var_file").Parse(`{{ range . }}
+var VarTemplate = template.Must(template.New("var_file").Parse(`
+/*
+ * Auto generated by tfvargen, Please do not modify it manually
+ */
+{{ range . }}
 variable "{{ .Name }}" {
   {{ if .Desc -}}
   description = "{{ .Desc }}"