Remove unused dependency on aeson.

hbro.cabal

@@ -22,7 +22,6 @@ Source-repository head
 
 Library
     Build-depends:
-        aeson,
         base == 4.*,
         bytestring,
         classy-prelude >= 0.12,

library/Network/URI/Extended.hs

@@ -13,19 +13,10 @@ module Network.URI.Extended
 import           Hbro.Error
 import           Hbro.Prelude
 
-import           Data.Aeson
-
 import           Network.URI  as X hiding (parseURI, parseURIReference)
 import qualified Network.URI  as N
 -- }}}
 
-instance FromJSON URI where
-    parseJSON (String t) = maybe mzero return $ parseURIReference t
-    parseJSON _ = mzero
-
-instance ToJSON URI where
-    toJSON = String . tshow
-
 -- | Generalized version of 'N.parseURIReference'.
 parseURIReference :: (MonadThrow m) => Text -> m URI
 parseURIReference uri = N.parseURIReference (unpack uri) `failWith` InvalidUri uri