Support running the bot under Windows

aiodns requires this event loop type on windows, as it does not work on the default loop.

Author: ChrisLovering

bot/__init__.py

@@ -1,5 +1,6 @@
 """The main bot module, contains all code for the bot application."""
 
+import asyncio
 import logging
 import os
 from pathlib import Path
@@ -30,6 +31,10 @@
 console_handler.setFormatter(log_formatter)
 log.addHandler(console_handler)
 
+# On Windows, the selector event loop is required for aiodns.
+if os.name == "nt":
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
 log.info("Cleaning out image_cache")
 
 img_dir = os.listdir(IMG_CACHE)