Build failure with GHC 9.0.1

[sjakobi]

src/Data/Conf/PrettyPrint.hs:57:17: error:
    Ambiguous occurrence ‘<>’
    It could refer to
       either ‘Prelude.<>’,
              imported from ‘Prelude’ at src/Data/Conf/PrettyPrint.hs:16:8-28
              (and originally defined in ‘GHC.Base’)
           or ‘Text.PrettyPrint.HughesPJClass.<>’,
              imported from ‘Text.PrettyPrint.HughesPJClass’ at src/Data/Conf/PrettyPrint.hs:28:1-47
              (and originally defined in ‘Text.PrettyPrint.HughesPJ’)
   |
57 |             "#" <> ttext c
   |                 ^^

src/Data/Conf/PrettyPrint.hs:63:13: error:
    Precedence parsing error
        cannot mix ‘<+>’ [infixl 6] and ‘Prelude.<>’ [infixr 6] in the same infix expression
   |
63 |             ttext t <+> thsep ts <> ";"
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/Conf/PrettyPrint.hs:63:34: error:
    Ambiguous occurrence ‘<>’
    It could refer to
       either ‘Prelude.<>’,
              imported from ‘Prelude’ at src/Data/Conf/PrettyPrint.hs:16:8-28
              (and originally defined in ‘GHC.Base’)
           or ‘Text.PrettyPrint.HughesPJClass.<>’,
              imported from ‘Text.PrettyPrint.HughesPJClass’ at src/Data/Conf/PrettyPrint.hs:28:1-47
              (and originally defined in ‘Text.PrettyPrint.HughesPJ’)
   |
63 |             ttext t <+> thsep ts <> ";"
   |                                  ^^
cabal: Failed to build language-conf-0.2.2.0.

[hughjfchen]

I've created a PR to fix this issue and also add aeson v2 support. see this #5

[sjakobi]

Since there seems to be some interest in this package, I've used my Hackage trustee powers to add some upper bounds to the existing releases on Hackage. See e.g. https://hackage.haskell.org/package/language-conf-0.2.2.0/revisions/.