Mark current version as 0.5.0

NEWS

@@ -1,4 +1,4 @@
-0.4.2	UNRELEASED
+0.5.0	UNRELEASED
 
  BUG FIXES
 

dulwich/__init__.py

@@ -27,4 +27,4 @@ import protocol
 import repo
 import server
 
-__version__ = (0, 4, 2)
+__version__ = (0, 5, 0)

setup.py

@@ -7,7 +7,7 @@ try:
 except ImportError:
     from distutils.core import setup, Extension
 
-dulwich_version_string = '0.4.2'
+dulwich_version_string = '0.5.0'
 
 include_dirs = []
 # Windows MSVC support