Add an empty line at the end of the file.

conf/drupalizer.py

@@ -42,4 +42,4 @@ env.container_ip = '172.17.0.0'
 # Hook commands
 
 env.hook_post_install = ['drush fra -y', 'drush cc all']
-env.hook_post_update= ['drush fra -y', 'drush cc all']
\ No newline at end of file
+env.hook_post_update= ['drush fra -y', 'drush cc all']