Reformat N2VC to standardized format

Change-Id: I7bfc2236cd5f059dc1b659e9fb746fef619124b8
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/n2vc/utils.py b/n2vc/utils.py
index f0146a0..0dbd71e 100644
--- a/n2vc/utils.py
+++ b/n2vc/utils.py
@@ -33,7 +33,11 @@
     try:
         cacert = base64.b64decode(b64string).decode("utf-8")
 
-        cacert = re.sub(r"\\n", r"\n", cacert,)
+        cacert = re.sub(
+            r"\\n",
+            r"\n",
+            cacert,
+        )
     except binascii.Error as e:
         raise N2VCInvalidCertificate(message="Invalid CA Certificate: {}".format(e))