docs: upgrade to premium shields.io badges

Author: swapwarick

README.md

@@ -2,10 +2,11 @@
   <h1>🧠 Agent Diaries</h1>
   <p><strong>Give your autonomous AI agents a persistent memory.</strong></p>
 
-  [![npm version](https://img.shields.io/npm/v/@swapwarick_n/agent-diaries.svg?style=flat-square)](https://www.npmjs.com/package/@swapwarick_n/agent-diaries)
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 </div>
 
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