Bump version 2.8.1

Author: henrikek

setup.py

@@ -16,7 +16,7 @@
 
 setup(
     name='django-mssql-backend',
-    version='2.8.0',
+    version='2.8.1',
     description='Django backend for Microsoft SQL Server',
     long_description=open('README.rst').read(),
     author='ES Solutions AB',