chore(letter): minor fix build

src/Handler/PrintCenter.hs

@@ -8,6 +8,10 @@ module Handler.PrintCenter
   ) where
 
 import Import
+
+--import qualified Data.Set as Set
+import qualified Data.Map as Map
+
 import qualified Data.Text      as T
 import qualified Data.Text.Lazy as LT
 import qualified Data.ByteString.Lazy as LBS
@@ -15,7 +19,7 @@ import qualified Text.Pandoc          as P
 import qualified Text.Pandoc.Builder  as P
 
 import qualified Database.Esqueleto.Legacy as E
--- import qualified Database.Esqueleto.Utils as E
+import qualified Database.Esqueleto.Utils as E
 import Database.Esqueleto.Utils.TH
 
 import qualified Control.Monad.State.Class as State