Bump della versione a 0.9.1

diff --git a/setup.py b/setup.py
index 735c164..1fd6cf3 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from distutils.core import setup

 setup (name='drprint',
-       version='0.9.0-rc4',
+       version='0.9.1',
        author='Leonardo Robol',
        author_email='leo@robol.it',
        url='http://www.robol.it/~leonardo/',