re-orgainzied code a little, using go templates instead format string

example.hcl

@@ -15,6 +15,5 @@ verbose = true
 outdir = "test"
 
 # template. leave empty to use the default one, which is:
-# Title: %s\nPrice: %s\nId: %s\nCategory: %s\nCondition: %s\nCreated: %s\nBody:\n\n%s\n
-# take care to include exactly 7 times '%s'!
+# "Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\nCategory: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n"
 template = ""