fix: edns error

Author: duanhongyi

setup.py

@@ -25,7 +25,7 @@
 
     name='smartdns',
     description='An Intelligent DNS Similar to DNSPod',
-    version='3.3.4',
+    version='3.3.5',
     author='duanhongyi',
     author_email='duanhyi@gmail.com',
     packages=find_packages(),

smartdns/server.py

@@ -200,7 +200,7 @@ def handleQuery(self, message, protocol, address):
                 len(message.additional) != 0 and \
                 message.additional[0].type == 41 and \
                 message.additional[0].rdlength > 8:
-            if isinstacne(message.additional[0].payload, dns.Record_A):
+            if isinstance(message.additional[0].payload, dns.Record_A):
                 cliAddr = (message.additional[0].payload.dottedQuad(), 0)
             edns = message.additional[0]
         return self.resolver.query(query, addr=cliAddr, edns=edns).addCallback(