bump version to 1.8.1 for release

Author: attwad

CHANGELOG.md

@@ -5,7 +5,13 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ## [Unreleased]
 
-- Nothing yet.
+- Nothing yet
+
+## [1.8.1]
+
+- Add options to UdpClient to force the use of IPv4 when IPv6 is available and vice versa
+
+- Add support for arguments with Nil type
 
 ### [1.8.0]
 

setup.py

@@ -13,7 +13,7 @@
 
 setup(
     name='python-osc',
-    version='1.8.0',
+    version='1.8.1',
     author='attwad',
     author_email='tmusoft@gmail.com',
     description=(