chore(examples): usage of nested POST parameters (#15)

Author: nyg

examples/src/main/java/dev/andstuff/kraken/example/SimpleExamples.java

@@ -64,6 +64,8 @@ public static void main(String[] args) {
                 "pair", "XLTCZUSD",
                 "price", "1000",
                 "oflags", "post,fciq",
+                "close[ordertype]", "limit",
+                "close[price]", "1500",
                 "validate", "true"));
         log.info("{}", order);
     }

library/src/main/java/dev/andstuff/kraken/api/model/endpoint/priv/PostParams.java

@@ -16,9 +16,7 @@ public String initNonce() {
         return nonce;
     }
 
-    // TODO handle nested props
     public String encoded() {
-
         Map<String, String> params = params();
         params.put("nonce", nonce);