v0.21.0rc2

What's Changed

• refresh token if within 5 minutes of expiring; else reuse by @swanderz in #158
• add sqlserver__alter_column_type macro by @dlarsen5 in #169
• small changes for 0.21.0 by @swanderz in #168
• enable CTES in test defs by @swanderz in #167

New Contributors

• @dlarsen5 made their first contribution in #169

Full Changelog: v0.20.1...v0.21.0rc2