Fix release note style

Author: xerial

RELEASE_NOTES.md

@@ -1,13 +1,13 @@
 # Release Notes
 
-* 0.8.1
+## 0.8.1
  * MessagePack.Packer/UnpackerConfig are now immuable and configurable with withXXX methods.
  * Allow setting null to ArrayBufferInput for advanced applications that require dedicated memory management.
  * Fix MessageBufferPacker.toXXX to properly flush the output
  * Modify ValueFactory methods to produce a copy of the input data. To omit the copy, use `omitCopy` flag.
  * Improve the performance of MessagePackParser by unpacking data without using org.msgpack.value.Value.
 
-* 0.8.0
+## 0.8.0
  * Split MessagePack.Config into MessagePack.Packer/UnpackerConfig 
  * Changed MessageBuffer API 
  * It allows releasing the previously allocated buffers upon MessageBufferInput.next() call.
@@ -17,36 +17,36 @@
  * Performance improvement of packString
  * Add MessageBufferPacker for efficiently generating byte array(s) of message packed data
 
-* 0.7.1
+## 0.7.1
  * Fix ImmutableLongValueImpl#asShort [#287](https://github.com/msgpack/msgpack-java/pull/287)
 
-* 0.7.0
+## 0.7.0
  * Support non-string key in jackson-dataformat-msgpack
  * Update the version of jackson-databind to 2.6.3
  * Several bug fixes
 
-* 0.7.0-M6
+## 0.7.0-M6
  * Add a prototype of Value implementation
  * Apply strict coding style
  * Several bug fixes
 
-* 0.7.0-p9
+## 0.7.0-p9
  * Fix [#217](https://github.com/msgpack/msgpack-java/issues/217) when reading from SockectInputStream 
 
-* 0.7.0-p8
+## 0.7.0-p8
  * Support Extension type (defined in MessagePack) in msgpack-jackson
  * Support BigDecimal type (defined in Jackson) in msgpack-jackson
  * Fix MessageUnpacker#unpackString [#215](https://github.com/msgpack/msgpack-java/pull/215), [#216](https://github.com/msgpack/msgpack-java/pull/216)
 
-* 0.7.0-p7
+## 0.7.0-p7
  * Google App Engine (GAE) support
 
-* 0.7.0-p6
+## 0.7.0-p6
  * Add MessagePacker.getTotalWrittenBytes()
 
-* 0.7.0-p5
+## 0.7.0-p5
  * Fix skipValue [#185](https://github.com/msgpack/msgpack-java/pull/185)
 
-* 0.7.0-p4
+## 0.7.0-p4
  * Supporting some java6 platform and Android