2.2.1

Changes:

• Remove nodes from the color contrast incompleteData API to avoid circular references

2.2.0

Changes:
- Add configuration options for iframes: false, selectors: false, and elementRef: true
- Improve color-contrast rule for disabled elements
- Add webdriver task for testing mobile viewports
- Improve audio/video captioning rules
- Improve th-has-data-cells rule
- Expose incomplete reasons for color contrast rule as part of Needs Review
- Implement rule groupings as tags
- Allow building of axe in multiple languages
- Empty-heading rule has impact: moderate