fixed slack invitation link in README.md
Used a permanent invitation link in the README. This uglifies the
text version of the readme a bit, but the link never experies as
oppose to using tiny URLs.
Fixes:
@@ -139,8 +139,8 @@ Frequently asked questions are collected in our [FAQ doc](FAQ.md).
You can get in touch with the Firecracker community in the following ways:
- Security-related issues, see our [security policy document](SECURITY-POLICY.md).
- Chat with us on our
- [Slack workspace](https://tinyurl.com/firecracker-microvm). _Note: most of the
- maintainers are on a European time zone._
+ [Slack workspace](https://join.slack.com/t/firecracker-microvm/shared_invite/enQtNDY2NTUwMzQ3MDE1LWIwMzA0OWFkMTZhMTlmMDZiMmFkYjMyODMxMGQ1ZjliMzJjNjJiNWRhNWNkOGEyNmUxNmRkMjZhYTc3MmVjZjM).
+ _Note: most of the maintainers are on a European time zone._
- Open a GitHub issue in this repository.
- Email the maintainers at
[firecracker-maintainers@amazon.com](mailto:firecracker-maintainers@amazon.com).
