Change some format usage to use %-formatting.

Minor speed increase when we're not doing excessive attribute
access or any type of formatting.

discord/abc.py

@@ -194,7 +194,7 @@ class GuildChannel:
     @property
     def mention(self):
         """str : The string that allows you to mention the channel."""
-        return '<#{0.id}>'.format(self)
+        return '<#%s>' % self.id
 
     @property
     def created_at(self):

discord/client.py

@@ -210,7 +210,7 @@ class Client:
                 pass
 
     def dispatch(self, event, *args, **kwargs):
-        log.debug('Dispatching event {}'.format(event))
+        log.debug('Dispatching event %s', event)
         method = 'on_' + event
         handler = 'handle_' + event
 

discord/member.py

@@ -249,8 +249,8 @@ class Member(discord.abc.Messageable):
     def mention(self):
         """Returns a string that mentions the member."""
         if self.nick:
-            return '<@!{}>'.format(self.id)
-        return '<@{}>'.format(self.id)
+            return '<@!%s>' % self.id
+        return '<@%s>' % self.id
 
     @property
     def display_name(self):

discord/message.py

@@ -285,18 +285,18 @@ class Message:
         """
 
         transformations = {
-            re.escape('<#{0.id}>'.format(channel)): '#' + channel.name
+            re.escape('<#%s>' % channel.id): '#' + channel.name
             for channel in self.channel_mentions
         }
 
         mention_transforms = {
-            re.escape('<@{0.id}>'.format(member)): '@' + member.display_name
+            re.escape('<@%s>' % member.id): '@' + member.display_name
             for member in self.mentions
         }
 
         # add the <@!user_id> cases as well..
         second_mention_transforms = {
-            re.escape('<@!{0.id}>'.format(member)): '@' + member.display_name
+            re.escape('<@!%s>' % member.id): '@' + member.display_name
             for member in self.mentions
         }
 
@@ -305,7 +305,7 @@ class Message:
 
         if self.guild is not None:
             role_transforms = {
-                re.escape('<@&{0.id}>'.format(role)): '@' + role.name
+                re.escape('<@&%s>' % role.id): '@' + role.name
                 for role in self.role_mentions
             }
             transformations.update(role_transforms)

discord/role.py

@@ -148,7 +148,7 @@ class Role(Hashable):
     @property
     def mention(self):
         """Returns a string that allows you to mention a role."""
-        return '<@&{}>'.format(self.id)
+        return '<@&%s>' % self.id
 
     @property
     def members(self):