not it was some work

cogs/joinleave.py

 		self.con.load_config()
 		if not self.servers[member.server.id]["greets"]["enabled"]:
 			return
+
 		if self.servers[member.server.id]["greets"]["custom-message"]:
 			message = self.servers[member.server.id]["greets"]["custom-message"]
 		else:
 			message = self.servers[member.server.id]["greets"]["default-message"]
-		# TODO: Maybe thumbnail for the embed
 		em = discord.Embed(
 			title="Welcome to {}!".format(member.server),
 			description='Hey {}! Welcome to **{}**! {}'.format(member.mention, member.server, message),
 			colour=0xDEADBF)
+		em.set_thumbnail(url=member.avatar_url)
 
 		if self.servers[member.server.id]["greets"]["welcome-channel"]:
 			channel = discord.Object(self.servers[member.server.id]["greets"]["welcome-channel"])
 		else:
 			channel = member.server.default_channel
-		return await self.bot.send_message(channel,embed=em)
+		return await self.bot.send_message(member.server.default_channel,embed=em)
 
 	async def on_member_remove(self, member):
+		"""
+		The same but the opposite
+		"""
 		self.con.load_config()
 		if not self.servers[member.server.id]["goodbyes"]["enabled"]:
 			return

config/cogs.py

 cogs = [
-	"cogs.selfassign"
+	"cogs.selfassign",
+	"cogs.joinleave"
 ]

config/servers.json

-{"304048071963312130": {"greets": {"enabled": 0, "welcome-channel": "", "member-role": "", "custom-message": "", "default-message": "Be sure to read the rules."}, "goodbyes": {"enabled": 0, "goodbye-channel": ""}, "selfAssign": {"enabled": 0, "roles": ["307330606348632064", "308081570059649024", "308081662787321861"]}, "twitch": {"enabled": 0, "twitch-channel": "", "whitelist": {"enabled": 0, "list": []}}, "mute": {"role": "", "admin-role": []}}}
+{"304048071963312130": {"greets": {"enabled": 1, "welcome-channel": "", "member-role": "", "custom-message": "", "default-message": "Be sure to read the rules."}, "goodbyes": {"enabled": 0, "goodbye-channel": ""}, "selfAssign": {"enabled": 0, "roles": ["307330606348632064", "308081570059649024", "308081662787321861"]}, "twitch": {"enabled": 0, "twitch-channel": "", "whitelist": {"enabled": 0, "list": []}}, "mute": {"role": "", "admin-role": []}}}