Remove unused code

src/epplibwrapper/client.py

@@ -1,10 +1,9 @@
 """Provide a wrapper around epplib to handle authentication and errors."""
 
 import logging
+
 from time import sleep
-
 from gevent import Timeout
-
 from epplibwrapper.utility.pool_status import PoolStatus
 
 try:

src/epplibwrapper/errors.py

@@ -83,9 +83,6 @@ class RegistryError(Exception):
     def is_client_error(self):
         return self.code is not None and (self.code >= 2000 and self.code <= 2308)
 
-    def is_not_retryable(self):
-        pass
-
 
 class LoginError(RegistryError):
     pass