certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')]

#エラーが出た
Discordbotを試そうとしたらエラーが出たので備忘録...

```
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 936, in _wrap_create_connection
    return await self._loop.create_connection(*args, **kwargs)  # type: ignore  # noqa
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/asyncio/base_events.py", line 1042, in create_connection
    transport, protocol = await self._create_connection_transport(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/asyncio/base_events.py", line 1072, in _create_connection_transport
    await waiter
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/asyncio/sslproto.py", line 529, in data_received
    ssldata, appdata = self._sslpipe.feed_ssldata(data)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/asyncio/sslproto.py", line 189, in feed_ssldata
    self._sslobj.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/ssl.py", line 944, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "main.py", line 27, in <module>
    client.run(TOKEN)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/client.py", line 640, in run
    return future.result()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/client.py", line 621, in runner
    await self.start(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/client.py", line 584, in start
    await self.login(*args, bot=bot)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/client.py", line 442, in login
    await self.http.static_login(token.strip(), bot=bot)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/http.py", line 261, in static_login
    data = await self.request(Route('GET', '/users/@me'))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/discord/http.py", line 165, in request
    async with self.__session.request(method, url, **kwargs) as r:
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/client.py", line 1012, in __aenter__
    self._resp = await self._coro
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/client.py", line 480, in _request
    conn = await self._connector.connect(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 523, in connect
    proto = await self._create_connection(req, traces, timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 858, in _create_connection
    _, proto = await self._create_direct_connection(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 1004, in _create_direct_connection
    raise last_exc
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 980, in _create_direct_connection
    transp, proto = await self._wrap_create_connection(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/aiohttp/connector.py", line 938, in _wrap_create_connection
    raise ClientConnectorCertificateError(
aiohttp.client_exceptions.ClientConnectorCertificateError: Cannot connect to host discordapp.com:443 ssl:True [SSLCertVerificationError: (1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')]
```
#環境
- MacOS Mojave
- Python 3.8

#解決

```
cd "/Applications/Python 3.8/"
#(僕の場合はバージョン3.8ですが使ってるバージョンに置き換えて下さい。）
"./Install Certificates.command"
```