return a more descriptive error when parsing an API response fails

Author: michael-paystack

paystack/src/main/java/co/paystack/android/api/model/TransactionApiResponse.java

@@ -35,7 +35,10 @@ public static TransactionApiResponse fromJsonString(String jsonString) {
         try {
             return new Gson().fromJson(jsonString, TransactionApiResponse.class);
         } catch (Exception e) {
-            return TransactionApiResponse.unknownServerResponse();
+            TransactionApiResponse t = new TransactionApiResponse();
+            t.status = "0";
+            t.message = e.getMessage();
+            return t;
         }
     }