Remove unnecessary blank line in csv.py

Author: ericwb

bandit/formatters/csv.py

@@ -27,7 +27,6 @@
     New field `CWE` added to output
 
 """
-
 # Necessary for this formatter to work when imported on Python 2. Importing
 # the standard library's csv module conflicts with the name of this module.
 import csv