v5.12.1

What's Changed

• feature/readme migration v6 by @lavigne958 in #1297
• add deprecation warnings for lastUpdateTime... by @alifeee in #1333
• remove use_index and references to it in get_records by @alifeee in #1343
• make deprecation warning dependent on if kwarg is used for client_factory by @alifeee in #1349
• fix 1352 expected headers broken by @alifeee in #1353
• fix combine_merged_cells when using from a range that doesn't start at A1 by @alifeee in #1335

Full Changelog: v5.12.0...v5.12.1