fix: don't fail in systems with windows 1252 encoding (probably)

Fixes #1186

copier/template.py

@@ -84,7 +84,7 @@ class _Loader(yaml.FullLoader):
         loader_class=_Loader, base_dir=conf_path.parent
     )
 
-    with open(conf_path) as f:
+    with conf_path.open("rb") as f:
         try:
             flattened_result = lflatten(yaml.load_all(f, Loader=_Loader))
         except yaml.parser.ParserError as e: