Update README.md

Author: Yevgeny Pats

README.md

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 [![fuzzit](https://app.fuzzit.dev/static/fuzzit-passing-green.svg)](https://app.fuzzit.dev)
 [![license](https://app.fuzzit.dev/static/license-apache-blue.svg)](https://github.com/fuzzitdev/Fuzzit/blob/master/LICENSE)
-[![Join the chat at https://slack.fuzzit.dev](https://app.fuzzit.dev/static/slack-join.svg)](https://slack.fuzzit.dev)
 
 ## Fuzzit
 [Fuzzit](https://fuzzit.dev) helps you integrate Continuous Fuzzing to your [C/C++](https://github.com/fuzzitdev/example-c),