Bump version to 2.4

Author: Peter Amstutz

setup.py

@@ -15,7 +15,7 @@
     long_description = readmeFile.read()
 
 setup(name='wes-service',
-      version='2.3',
+      version='2.4',
       description='GA4GH Workflow Execution Service reference implementation',
       long_description=long_description,
       author='GA4GH Containers and Workflows task team',