fix: now _plain_tokenizer is plain_tokenizer

Author: hgrecco

pint/testsuite/benchmarks/test_01_eval.py

@@ -2,8 +2,7 @@
 
 import pytest
 
-from pint.pint_eval import _plain_tokenizer as plain_tokenizer
-from pint.pint_eval import uncertainty_tokenizer
+from pint.pint_eval import plain_tokenizer, uncertainty_tokenizer
 
 VALUES = [
     "1",

pint/testsuite/test_pint_eval.py

@@ -2,8 +2,7 @@
 
 import pytest
 
-from pint.pint_eval import _plain_tokenizer as plain_tokenizer
-from pint.pint_eval import build_eval_tree, uncertainty_tokenizer
+from pint.pint_eval import build_eval_tree, plain_tokenizer, uncertainty_tokenizer
 from pint.util import string_preprocessor
 
 TOKENIZERS = (plain_tokenizer, uncertainty_tokenizer)