ENH: DataReaders return missing data as NaN rather than warn.

Fixes #8433
Merge pull request #8743 from dstephens99/issue8433

BUG: DataReaders return missing data as NaN rather than warn.
pd.show_versions()

Shouldn't this be `pd.show_versions()`? Maybe it's a typo.
Merge pull request #8746 from gepcel/master

pd.show_versions()
BUG: Fix io.data.Options quote time for DST.

Added new test for live quote time and updated the second test html so that it uses a DST sample.

DOC: Add issue to release notes, note in tests.
Merge pull request #8741 from dstephens99/issue8612

BUG: Fix io.data.Options quote time for DST.
BUG: Allow non-float values in get_yahoo_quotes.

Fixes issue: #5229
Merge pull request #8742 from dstephens99/issue5229

BUG: Allow non-float values in get_yahoo_quotes.
WIP: Index.get_slice_bound