[V3] use uvloop if available (#1935)

* use uvloop if available

* Update __main__.py

requested changes made

redbot/__main__.py

@@ -19,6 +19,15 @@ import logging.handlers
 import logging
 import os
 
+# Let's not force this dependency, uvloop is much faster on cpython
+if sys.implementation.name == "cpython":
+    try:
+        import uvloop
+    except ImportError:
+        pass
+    else:
+        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+
 
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 #               Red - Discord Bot v3