Update README.md

README.md

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     <p>For more info on Haystack, visit our <strong><a href="https://github.com/deepset-ai/haystack">GitHub</a></strong> repo and <strong><a href="https://haystack.deepset.ai">Documentation</a></strong>. You can also <strong><a class="h-7" href="https://haystack.deepset.ai/community/join">join us on <img alt="slack" class="h-7 inline-block m-0" style="margin: 0" src="https://huggingface.co/spaces/deepset/README/resolve/main/Slack_RGB.png"/></a></strong>
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-    <p align="center"><strong>✨<a href="https://pypi.org/project/farm-haystack/">Haystack is on v1.5.0</a>✨</strong></p>
+    <p align="center"><strong>✨<a href="https://pypi.org/project/farm-haystack/">Haystack is on v1.6.0</a>✨</strong></p>
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