v1.0.0-alpha.3

What's Changed

• add make_sql_cell function by @kafonek in #140
• change cell types by @kafonek in #141
• Always return list of futures on queue_execution, guard against executing empty code cells by @kafonek in #144
• 1.0.0a3 release by @kafonek in #145

Full Changelog: v1.0.0-alpha.2...v1.0.0-alpha.3