Change Slack link

Author: phortx

README.md

@@ -36,7 +36,7 @@ You can find the complete documentation at https://vuex-orm.github.io/plugin-gra
 
 ## Questions & Discussions
 
-Join us on our [Slack Channel](https://join.slack.com/t/vuex-orm/shared_invite/enQtNDQ0NjE3NTgyOTY2LTI0YjE5YmNmMDIxNWZlNmJhM2EyMDg1MDRkODA4YmQwMDU5OWRkZmNhN2RmOTZkZGZkODQxZTRkYjhmYmJiNTY) for any questions and discussions.
+Join us on our [Slack Channel](https://join.slack.com/t/vuex-orm/shared_invite/enQtNDQ0NjE3NTgyOTY2LTc1YTI2N2FjMGRlNGNmMzBkMGZlMmYxOTgzYzkzZDM2OTQ3OGExZDRkN2FmMGQ1MGJlOWM1NjU0MmRiN2VhYzQ) for any questions and discussions.
 
 While there is the Slack Channel, do not hesitate to open an issue for any question you might have.
 We're always more than happy to hear any feedback, and we don't care what kind of form they are.