Remove unused dependency transformers-compat

Author: andreasabel

github.cabal

@@ -211,7 +211,6 @@ library
     , iso8601-time          >=0.1.5      && <0.2
     , network-uri           >=2.6.1.0    && <2.7
     , tagged                >=0.8.5      && <0.9
-    , transformers-compat   >=0.6.5      && <0.8
     , unordered-containers  >=0.2.10.0   && <0.3
     , vector                >=0.12.0.1   && <0.14