Put back monad trans import

Author: michaelpj

lsp-test/src/Language/LSP/Test/Session.hs

@@ -43,6 +43,7 @@ import Control.Exception
 import Control.Lens hiding (List, Empty)
 import Control.Monad
 import Control.Monad.IO.Class
+import Control.Monad.Trans.Class
 import Control.Monad.Catch (MonadThrow)
 import Control.Monad.Except
 #if __GLASGOW_HASKELL__ == 806