allow zest.releaser to set the version in __init__.py. cleanup

CHANGES.rst

@@ -10,8 +10,11 @@ New:
 
 Fixes:
 
-- Documentation fixes
-- Added __version__attribute to init.py
+- Added __version__ attribute to init.py
+  [TomTry]
+
+- Documentation fixes.
+  [TomTry]
 
 
 3.9.1 (2015-09-08)

setup.cfg

@@ -0,0 +1,3 @@
+[zest.releaser]
+# Allow setting the version by zest.releaser
+python-file-with-version = src/icalendar/__init__.py

setup.py

@@ -4,7 +4,6 @@ import sys
 import re
 import ast
 
-from setuptools import setup
 _version_re = re.compile(r'__version__\s+=\s+(.*)')
 
 with open('src/icalendar/__init__.py', 'rb') as f: