GUA-455 Update deprecation notice for Gajira (#28)

Author: yvonnevictoria

README.md

@@ -1,7 +1,7 @@
 # Github Actions Jira CLI
 
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-⚠️ This repository isn’t maintained anymore.
+⚠️ This repository is no longer maintained and all Gajira actions have been deprecated.
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 Download and set up go-jira CLI. Check out [go-jira documentation](https://github.com/Netflix-Skunkworks/go-jira) for more arguments and usage details