Remove unused import

Author: hwalinga

pandas/core/computation/parsing.py

@@ -5,7 +5,7 @@
 from keyword import iskeyword
 import token
 import tokenize
-from typing import Iterator, Tuple, Union
+from typing import Iterator, Tuple
 
 # A token value Python's tokenizer probably will never use.
 BACKTICK_QUOTED_STRING = 100