fixed FLAKE8 on webhook object

Signed-off-by: Victor Lee <victorlee0505@gmail.com>

Author: victorlee0505

aries_cloudagent/protocols/issue_credential/v1_0/messages/credential_exchange_webhook.py

@@ -1,4 +1,5 @@
-"""v1.0 credential exchange light weight webhook"""
+"""v1.0 credential exchange light weight webhook."""
+
 
 class LightWeightV10CredentialExchangeWebhook:
     """Class representing a state only credential exchange webhook."""
@@ -33,7 +34,8 @@ def __init__(
         **kwargs,
     ):
         """
-        Initialize webhook object from V10CredentialExchange
+        Initialize webhook object from V10CredentialExchange.
+
         from a list of accepted attributes.
         """
         [

aries_cloudagent/protocols/issue_credential/v2_0/messages/cred_ex_record_webhook.py

@@ -1,4 +1,5 @@
-"""v2.0 credential exchange light weight webhook"""
+"""v2.0 credential exchange light weight webhook."""
+
 
 class LightWeightV20CredExRecordWebhook:
     """Class representing a state only credential exchange webhook."""
@@ -33,7 +34,8 @@ def __init__(
         **kwargs,
     ):
         """
-        Initialize webhook object from V20CredExRecord
+        Initialize webhook object from V20CredExRecord.
+
         from a list of accepted attributes.
         """
         [