use ipaddress not ipaddr

setup.py

@@ -29,7 +29,7 @@ setup(name="magic-wormhole",
                         "autobahn[twisted] >= 0.14.1",
                         "hkdf", "tqdm",
                         ],
-      extras_require={"tor": ["txtorcon", "ipaddr"]},
+      extras_require={"tor": ["txtorcon", "ipaddress"]},
       test_suite="wormhole.test",
       cmdclass=commands,
       )

src/wormhole/tor_manager.py

@@ -3,7 +3,7 @@ import time
 from twisted.internet.defer import inlineCallbacks, returnValue
 from twisted.internet.error import ConnectError
 import txtorcon
-import ipaddr
+import ipaddress
 from .timing import DebugTiming
 from .transit import allocate_tcp_port
 
@@ -112,7 +112,7 @@ class TorManager:
         # for numeric hostnames, skip RFC1918 addresses, since no Tor exit
         # node will be able to reach those. Likewise ignore IPv6 addresses.
         try:
-            a = ipaddr.IPAddress(host)
+            a = ipaddress.ip_address(host)
         except ValueError:
             return False # non-numeric, let Tor try it
         if a.version != 4: