Close aiohttp client session on cog unload (#235)

* Close `aiohttp.ClientSession` on `cog_unload` & some type hinting.

* `pre-commit run --all-files` 😃

README.md

@@ -37,7 +37,7 @@ You can contact me in the Red 3rd party server in #support_flare-cogs
 | Crypto         | 0.1.0            | <details><summary>Buy and sell cyrptocurrencies with Red economy.</summary>Buy and sell cryptocurrencies with Red economy.</details>                                                              | flare(flare#0001), Flame, and TrustyJAID |
 | DmInvites      | 0.0.4            | <details><summary>Respond with the bot invite link when DM'd a server invite link.</summary>Respond with the bots invite link if the bot recieves a message containing a server invite.</details> | flare(flare#0001)                        |
 | VerifyEmail    | 0.1.1            | <details><summary>Secure your server by making users verify their account with an email.</summary></details>                                                                                      | flare(flare#0001)                        |
-| F1             | 0.4.0            | <details><summary>Data related to F1.</summary>F1 data, races, drivers, constructors etc.</details>                                                                                               | flare(flare#0001)                        |
+| F1             | 0.4.1            | <details><summary>Data related to F1.</summary>F1 data, races, drivers, constructors etc.</details>                                                                                               | flare(flare#0001)                        |
 | Faceit         | 0.2.0            | <details><summary>List stats of faceit users, game history or specific games and even ongoing games!</summary></details>                                                                          | flare(flare#0001)                        |
 | Forward        | 1.2.9            | <details><summary>Forward messages sent to the bot to the bot owner or in a specified channel.</summary></details>                                                                                | flare(flare#0001) and Aikaterna          |
 | Giveaways      | 1.3.3            | <details><summary>Giveaway cog with features such duration or end timing, multipliers, role only acces, bank integration etc.</summary></details>                                                 | flare(flare#0001)                        |
@@ -46,7 +46,7 @@ You can contact me in the Red 3rd party server in #support_flare-cogs
 | Jsk            | 0.0.2            | <details><summary>Jishaku ported to Red.</summary></details>                                                                                                                                      | flare(flare#0001)                        |
 | Mod            | 1.3.0            | <details><summary>Mod with custom messages.</summary>Core mod with the inclusion of custom messages for banning, kicking and unbanning.</details>                                                 | flare(flare#0001)                        |
 | Covid          | 0.0.3            | <details><summary>Grab the latest headlines, nationally or globally.</summary>Grab breaking headline around the world!</details>                                                                  | flare(flare#0001)                        |
-| Palette        | 0.1.0            | <details><summary>Show colour palette of images, avatars etc.</summary>Show colour palette of images, avatars, emojis etc</details>                                                               | flare(flare#0001) and Kuro               |
+| Palette        | 0.1.1            | <details><summary>Show colour palette of images, avatars etc.</summary>Show colour palette of images, avatars, emojis etc</details>                                                               | flare(flare#0001) and Kuro               |
 | PermChecker    | 0.1.0            | <details><summary>This cog is a basic permission checker, used to check if a user/role/channel has a set permission.</summary></details>                                                          | flare(flare#0001)                        |
 | R6             | 1.6.0            | <details><summary>Show R6 Statistics.</summary>List R6 Statistics from seasons, individual operators, all operators and more!</details>                                                           | flare(flare#0001)                        |
 | RedditPost     | 0.6.0            | <details><summary>Reddit Autoposting of new content.</summary></details>                                                                                                                          | flare(flare#0001)                        |

f1/f1.py

@@ -8,6 +8,7 @@
 import tabulate
 from discord.mentions import AllowedMentions
 from redbot.core import Config, commands
+from redbot.core.bot import Red
 from redbot.core.utils.chat_formatting import box, pagify
 
 API_URL = "http://ergast.com/api/f1"
@@ -19,23 +20,25 @@
 class F1(commands.Cog):
     """F1 data."""
 
-    __version__ = "0.4.0"
+    __version__ = "0.4.1"
     __author__ = "flare"
 
     def format_help_for_context(self, ctx):
         """Thanks Sinbad."""
         pre_processed = super().format_help_for_context(ctx)
         return f"{pre_processed}\nCog Version: {self.__version__}\nAuthor: {self.__author__}"
 
-    def __init__(self, bot):
-        self.bot = bot
-        self.session = aiohttp.ClientSession()
-        self.config = Config.get_conf(self, identifier=95932766180343808)
+    def __init__(self, bot: Red) -> None:
+        self.bot: Red = bot
+        self.session: aiohttp.ClientSession = aiohttp.ClientSession()
+        self.config: Config = Config.get_conf(self, identifier=95932766180343808)
         self.config.register_guild(channel=None, role=None)
-        self.loop = asyncio.create_task(self.race_loop())
+        self.loop: asyncio.Task = asyncio.create_task(self.race_loop())
 
     async def cog_unload(self):
         self.loop.cancel()
+        if not self.session.closed:
+            asyncio.create_task(self.session.close())
 
     async def race_loop(self):
         await self.bot.wait_until_ready()