Fix st build

Summary: `RebindableSyntax` looks for `fromString` in scope.

Reviewed By: JonCoens

Differential Revision: D4675221

fbshipit-source-id: d7ff49d

Duckling/Resolve.hs

@@ -19,6 +19,7 @@ module Duckling.Resolve
   ) where
 
 import Data.Aeson
+import Data.String
 import qualified Data.Time as Time
 import qualified Data.Time.LocalTime.TimeZone.Series as Series
 import Prelude

duckling.cabal

@@ -21,6 +21,7 @@ library
   -- Core
                      , Duckling.Api
                      , Duckling.Engine
+                     , Duckling.Engine.Regex
                      , Duckling.Lang
                      , Duckling.Resolve
                      , Duckling.Stash