Fix flake8 minor issues

Change-Id: I1348e9807b8071a1cbf50b97144069a5b6709def
Signed-off-by: David Garcia <david.garcia@canonical.com>
(cherry picked from commit 5ab1064304b993ea6364b5d932c5c0cb7434cfb7)
diff --git a/n2vc/loggable.py b/n2vc/loggable.py
index d588a1d..b3b98da 100644
--- a/n2vc/loggable.py
+++ b/n2vc/loggable.py
@@ -115,7 +115,7 @@
         if not include_path:
             i = filename.rfind("/")
             if i > 0:
-                filename = filename[i + 1 :]
+                filename = filename[i + 1:]
 
         # datetime
         dt = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")