docs: updating README.md

Author: jonigl

README.md

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 <p align="center">
-  <img src="./misc/ollmcp-logo-512.png" width="256" />
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+  <img src="https://github.com/jonigl/mcp-client-for-ollama/blob/main/misc/ollmcp-logo-512.png?raw=true" width="256" />
 </p>
 <p align="center">
 <i>A simple yet powerful Python client for interacting with Model Context Protocol (MCP) servers using Ollama, allowing local LLMs to use tools.</i>