Remove unused imports

Author: bouwew

plugwise_usb/messages/requests.py

@@ -34,7 +34,6 @@
     NodeImageValidationResponse,
     NodeInfoResponse,
     NodePingResponse,
-    NodeRejoinResponse,
     NodeRemoveResponse,
     NodeResponse,
     NodeSpecificResponse,

plugwise_usb/network/registry.py

@@ -9,7 +9,7 @@
 
 from ..api import NodeType
 from ..constants import UTF8
-from ..exceptions import CacheError, MessageError, NodeError
+from ..exceptions import CacheError, NodeError
 from ..helpers.util import validate_mac
 from ..messages.requests import (
     CirclePlusScanRequest,