v0.12.6-patch for Crab (Unstable)

What's Changed

• Revert "Adapt staking upgrade" by @JayJay1024 in #81
• Update README.md by @hackfisher in #82
• Staking upgrade adaptation by @JayJay1024 in #85
• Fix(typo): Change Collactor to Collator by @nblogist in #87

New Contributors

• @nblogist made their first contribution in #87

Full Changelog: v0.12.4...v0.12.6-patch