v0.8.1 - Bugfix for Kaggle

What's Changed

• Expand .text error descriptions. by @MarkDaoust in #527
• Fix default_metadata for files API. by @MarkDaoust in #548
• Update version for 0.8.1 release. by @MarkDaoust in #554

Full Changelog: v0.8.0...0.8.1