bump version

Author: kuenishi

README.md

@@ -99,10 +99,16 @@ Apache License 2.0
 
 # Release Notes
 
+## 0.3.1
+
+- set back default style as jiffy
+- fix bugs around nil/null handling
+
 ## 0.3.0
 
 - supports map new in 17.0
 - jiffy-style maps will be deprecated in near future
+- set default style as map
 
 ## 0.2.8
 

src/msgpack.app.src

@@ -1,6 +1,6 @@
 {application, msgpack,
  [{description, "MessagePack serializer/deserializer"},
-  {vsn, "0.3.0"},
+  {vsn, "0.3.1"},
   {modules, 
    [msgpack]
   },