Update longclaw's address

https://trac.torproject.org/projects/tor/ticket/23592

docs/change_log.rst

@@ -77,6 +77,7 @@ The following are only available within Stem's `git repository
   * Added server descriptor's new protocol attribute (:spec:`eb4fb3c`)
   * Added extrainfo descriptor's new padding_counts attributes (:spec:`0803997`)
   * Shared randomness properties weren't being read in votes (:trac:`21102`)
+  * Updated longclaw authority's address (:trac:`23592`)
 
  * **Utilities**
 

stem/descriptor/remote.py

@@ -869,7 +869,7 @@ DIRECTORY_AUTHORITIES = {
   ),
   'longclaw': DirectoryAuthority(
     nickname = 'longclaw',
-    address = '199.254.238.52',
+    address = '199.58.81.140',
     or_port = 443,
     dir_port = 80,
     is_bandwidth_authority = True,