Bump version number

Author: btalb

setup.py

@@ -4,7 +4,7 @@
     long_description = fh.read()
 
 setup(name='benchbot_api',
-      version='2.2.1',
+      version='2.4.0',
       author='Ben Talbot',
       author_email='b.talbot@qut.edu.au',
       description='The BenchBot API for use with the BenchBot software stack',