bump the version number

Author: michiya

setup.py

@@ -19,7 +19,7 @@
 
 setup(
     name='django-pyodbc-azure',
-    version='1.11.13.0',
+    version='1.11.13.1',
     description='Django backend for Microsoft SQL Server and Azure SQL Database using pyodbc',
     long_description=open('README.rst').read(),
     author='Michiya Takahashi',