[V3 Core] Encoding issue fix (#1365)

* Don't let the system encoding screw with things,
specify opens as happening with utf-8 encoding

* And also deal with encoding issues because windows is a special snowflake
(see: #1366)

* let's just use the encoding param in str() rather than encode/decode...

redbot/cogs/trivia/trivia.py

@@ -465,7 +465,7 @@ class Trivia:
             raise FileNotFoundError("Could not find the `{}` category"
                                     "".format(category))
 
-        with path.open() as file:
+        with path.open(encoding='utf-8') as file:
             try:
                 dict_ = yaml.load(file)
             except yaml.error.YAMLError as exc: