psutil>=2.1.0; remove redundant parentheses

letsencrypt/client/standalone_authenticator.py

@@ -275,7 +275,7 @@ class StandaloneAuthenticator(object):
         listeners = [conn.pid for conn in psutil.net_connections()
                      if conn.status == 'LISTEN' and
                      conn.type == socket.SOCK_STREAM and
-                     (conn.laddr[1] == port)]
+                     conn.laddr[1] == port]
         try:
             if listeners and listeners[0] is not None:
                 # conn.pid may be None if the current process doesn't have

setup.py

@@ -26,7 +26,7 @@ install_requires = [
     'ConfArgParse',
     'jsonschema',
     'mock',
-    'psutil>2.1.0',  # net_connections introduced in 2.1.0
+    'psutil>=2.1.0',  # net_connections introduced in 2.1.0
     'pycrypto',
     'PyOpenSSL',
     'python-augeas',