Is `io.sql._SAFE_NAMES_WARNING` still relevant?

[awisse]

Is your feature request related to a problem?

When I try to dump a DataFrame which has spaces in columns into an SQLite database, I get the _SAFE_NAMES_WARNING. However, spaces in column names are no longer changed to underscores since version 0.14. This warning should be removed. IMHO it is no longer relevant.

Describe the solution you'd like

Remove the following lines from io/sql.py in function SQLiteTable._create_table_setup:

        pat = re.compile(r"\s+")
        column_names = [col_name for col_name, _, _ in column_names_and_types]
        if any(map(pat.search, column_names)):
            warnings.warn(_SAFE_NAMES_WARNING, stacklevel=6)

API breaking implications

None

Describe alternatives you've considered

None

Additional context

[EdAbati]

Hi, I would like to try to solve this one, if it is OK.