Update README.md

[mrubens]

Important

Update README.md to announce Roo Code 3.8 release with new features and improvements.

• Release Announcement:
  • Updates README.md to announce Roo Code 3.8 release.
  • Removes section on Claude 3.7 Sonnet.
• New Features:
  • Faster asynchronous checkpoints.
  • Support for .rooignore files.
  • Fixed terminal & gray screen issues.
  • Roo Code can run in multiple windows.
  • Experimental multi-diff editing strategy.
  • Subtask to parent task communication.
  • Updated DeepSeek provider.
  • New "Human Relay" provider.

^{This description was created by for 8acc583. It will automatically update as commits are pushed.}

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