chore: update support matrix

Signed-off-by: Ravi Chamarthy <[email protected]>

SECURITY.md

@@ -4,13 +4,13 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 1.4.x   | :white_check_mark: |
-| < 1.4.0 | :x:                |
+| 2.0.x   | :white_check_mark: |
+| < 2.0.0 | :x:                |
 
 ## Reporting a Vulnerability
 
 When a vulnerability is found, please *DO NOT* file a public issue. Instead,
 send an email to one of the core [maintainers](MAINTAINERS.md) and await
-acknowledgement _OR_ file a [private security issue](https://github.com/project-zot/zot/security/advisories). 
+acknowledgement *OR* file a [private security issue](https://github.com/project-zot/zot/security/advisories).
 Normally we expect to resolve the issue in 60 days. However should there be an exception
 the team will reach out for next steps.