Don't re-use YAML object

This builds on #56 so that the file-global `yaml` is never re-used.
Without this small change, technically you could load a file, have an
exception, and have issues loading future files.

Author: polm

srsly/_yaml_api.py

@@ -25,9 +25,6 @@ def dump(self, data, stream=None, **kw):
             return stream.getvalue()
 
 
-yaml = CustomYaml()
-
-
 def yaml_dumps(
     data: YAMLInput,
     indent_mapping: int = 2,
@@ -58,6 +55,7 @@ def yaml_loads(data: Union[str, IO]) -> YAMLOutput:
     data (str / file): The data to deserialize.
     RETURNS: The deserialized Python object.
     """
+    yaml = CustomYaml()
     try:
         return yaml.load(data)
     except Exception as e: