remove bad import from test_io.py

tests/test_io.py

@@ -8,7 +8,7 @@
 import unittest
 from tables_io import types, convert, io_open, read, write, iterator, check_columns, createIndexFile
 from tables_io.ioUtils import getInputDataLengthIndex
-from tables_io.testUtils import compare_table_dicts, compare_tables, make_test_data, check_deps
+from tables_io.testUtils import compare_table_dicts, compare_tables, check_deps
 from tables_io.lazy_modules import apTable, jnp, h5py, pd, pq