Enabled read messages for muted role

Disabled read message history and send messages
Checking with every channel if the muted role has the permissions. If not, it overwrites with the permissions required

cogs/moderation.py

@@ -298,7 +298,8 @@ class Moderation(Cog):
                 if role is None:
                     muted = await ctx.guild.create_role(name="Muted")
                     for channel in ctx.guild.channels:
-                        await channel.set_permissions(muted, read_messages=False)
+                        await channel.set_permissions(muted, read_messages=True, send_messages=False,
+                                                      read_message_history=False)
 
                     await mute_members(self.bot.db, ctx, members, reason, muted)
 
@@ -307,8 +308,13 @@ class Moderation(Cog):
 
                     for channel in ctx.guild.channels:
                         perms = channel.overwrites_for(role)
-                        if perms.read_messages:
+                        if not perms.read_messages:
-                            perms.read_messages = False
+                            perms.read_messages = True
+                        elif perms.send_messages:
+                            perms.send_messages = False
+                        elif perms.read_message_history:
+                            perms.read_message_history = False
+
                         await channel.set_permissions(role, overwrite=perms)
                         print(channel.name + "has been muted!")