[Python] pandas.RangeIndex._start/_stop/_step are deprecated

[asfimport]

There are public attributes added RangeIndex.start/stop/step, and the private _start/_stop/_step are deprecated. See pandas-dev/pandas#26581

Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Joris Van den Bossche / @jorisvandenbossche

PRs and other links:

• GitHub Pull Request #4572

_{Note: This issue was originally created as ARROW-5606. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 4572
#4572