Remove unused import from Main.hs

Removed unused import of Miso.String.

Author: dmjio

app/Main.hs

@@ -10,7 +10,6 @@ import           Miso.Html.Element as H
 import           Miso.Html.Event as E
 import           Miso.Html.Property as P
 import           Miso.Lens
-import           Miso.String
 import qualified Miso.CSS as CSS
 import           Miso.CSS (StyleSheet)
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