Update README.md

Author: hrishioa

README.md

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 <h3 align="center">Mandark is a bog-simple (~80kb) AI intern that can do a lot, including building himself.</h3>
 
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 ## Features
 
 - Run without installation
+- `mandark revert` to revert changes completely
 - Type `ask` followed by your question to ask a question about any codebase
 - Supports Claude-3.5 Sonnet, Haiku, GPT-4o-mini and GPT-4-turbo (now with llama405b from Fireworks)
 - Edit and create multiple files