Bump version for development; v0.4.1.dev0

Author: yyuu

setup.py

@@ -12,7 +12,7 @@
 
 setup(
   name='fluent-logger',
-  version='0.4.0',
+  version='0.4.1.dev0',
   description=desc,
   long_description=open(README).read(),
   package_dir={'fluent': 'fluent'},