Check API changes in whatsnew
Our whatsnew has several sections detailing API changes:

- https://pandas.pydata.org/pandas-docs/dev/whatsnew/v1.1.0.html#other-api-changes
- https://pandas.pydata.org/pandas-docs/dev/whatsnew/v1.1.0.html#backwards-incompatible-api-changes. According to our version policy we shouldn't have any API-breaking changes until 2.0

Many of these, like adding `DataFrame.value_counts` are fine and should just be moved to a different section.

Others like https://github.com/pandas-dev/pandas/pull/31905 will need to be looked at closely, and we'll need to determine if they're API breaking or bug fixes.