http-api-data: loosen bound

docker-engine.cabal

@@ -37,7 +37,7 @@ library
     , containers >=0.5.0.0 && <0.8
     , deepseq >= 1.4 && <1.6
     , exceptions >= 0.4
-    , http-api-data >= 0.3.4 && <0.6
+    , http-api-data >= 0.3.4 && <0.7
     , http-client >=0.5 && <0.8
     , http-client-tls
     , http-media >= 0.4 && < 0.9