PEP8 formatting updates.

sleekxmpp/plugins/xep_0258/security_labels.py

@@ -30,7 +30,7 @@ class XEP_0258(BasePlugin):
         register_stanza_plugin(Message, SecurityLabel)
         register_stanza_plugin(Iq, Catalog)
 
-    def get_catalog(self, jid, ifrom=None, block=True, 
+    def get_catalog(self, jid, ifrom=None, block=True,
                           callback=None, timeout=None):
         iq = self.xmpp.Iq()
         iq['to'] = jid

sleekxmpp/plugins/xep_0258/stanza.py

@@ -33,7 +33,7 @@ class Label(ElementBase):
 class DisplayMarking(ElementBase):
     name = 'displaymarking'
     namespace = 'urn:xmpp:sec-label:0'
-    plugin_attrib = 'display_marking' 
+    plugin_attrib = 'display_marking'
     interfaces = set(['fgcolor', 'bgcolor', 'value'])
 
     def get_fgcolor(self):