Update README.md

Author: DubiousCactus

README.md

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-# Bells & Whistles: a minimalist PyTorch-based framework for fast & flexible research
+# Bells & Whistles: a PyTorch micro-framework for fast & flexible research
 
 ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/DubiousCactus/bells-and-whistles/python-app.yml)
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