remove trailing whitespace

Author: mr-c

setup.py

@@ -9,7 +9,7 @@
 README = os.path.join(SETUP_DIR, 'README.rst')
 
 # if python3 runtime and `setup.py install` is called
-if sys.version_info.major == 3 and sys.argv[1] == 'install': 
+if sys.version_info.major == 3 and sys.argv[1] == 'install':
     print("Aborting installation. CWL Tool doesn't support Python 3 currently.")
     print("Install using Python 2 pip.")
     exit(1)