Add Slack channel
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-[![Slack](https://img.shields.io/badge/slack--channel-blue?logo=slack)](https://codecov.io/gh/semi-technologies/weaviate)
+[![Slack](https://img.shields.io/badge/slack--channel-blue?logo=slack)](https://join.slack.com/t/weaviate/shared_invite/zt-goaoifjr-o8FuVz9b1HLzhlUfyfddhw)
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