Release v0.0.26

What's Changed

• Update language guide to include a section on loops by @johnynek in #1539
• Update lib conf.jsons for v0.0.25 by @github-actions[bot] in #1538
• Add tests from issue 489 by @johnynek in #1542
• Add documentation of syntax that had been missed in docs previously by @johnynek in #1543
• Don't show stack on lib test assertion failures by @johnynek in #1544
• Fix the DataRepr environment for Matchless when Libraries are used by @johnynek in #1545
• Add links to issues for open todos by @johnynek in #1547
• Fix lib check issues by @johnynek in #1546

Full Changelog: v0.0.25...v0.0.26