Bump version 2.4.0

Author: OskarPersson

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name='django-mssql-backend',
-    version='2.3.0',
+    version='2.4.0',
     description='Django backend for Microsoft SQL Server',
     long_description=open('README.rst').read(),
     author='ES Solutions AB',