update setup.py version to 2.4.0

Author: aperrin66

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name='django-geo-spaas',
-    version='2.3.4',
+    version='2.4.0',
     description='Geo-Scientific Platform as a Service',
     zip_safe=False,
     author='Morten W. Hansen, Anton Korosov, Artem Moiseev, Jeong-Won Park, Adrien Perrin, A.Azamifard',