flip condition for JSON encoding to make android (tagged objects) default (#319)

simplexmq.cabal

@@ -27,8 +27,8 @@ extra-source-files:
     README.md
     CHANGELOG.md
 
-if (os(linux))
-  ghc-option: -DANDROID
+if (os(darwin))
+  ghc-option: -DIOS
 
 library
   exposed-modules:

src/Simplex/Messaging/Parsers.hs

@@ -98,10 +98,10 @@ enumJSON tagModifier =
     }
 
 sumTypeJSON :: (String -> String) -> J.Options
-#if defined(ANDROID)
-sumTypeJSON = taggedObjectJSON
-#else
+#if defined(IOS)
 sumTypeJSON = singleFieldJSON
+#else
+sumTypeJSON = taggedObjectJSON
 #endif
 
 taggedObjectJSON :: (String -> String) -> J.Options