docs: update security policy supported versions

Updated supported versions to note that only latest version will be supported.

Refs: #25

Author: be904619

SECURITY.md

@@ -2,12 +2,10 @@
 
 ## Supported Versions
 
-Currently supported versions of this project are detailed below.
-
-| Version | Supported          |
-|---------| ------------------ |
-| 0.1.x   | :white_check_mark: |
-
+Coreax is supported on a best endeavours basis. Patches will be applied to the
+latest version rather than retroactively to older versions. To ensure you are using
+the most secure version of Coreax, please make sure you have the
+[latest release](https://github.com/gchq/coreax/releases/latest).
 
 ## Reporting a Vulnerability
 
@@ -18,7 +16,7 @@ basis. We hope that the community will continue to support us as we endeavour to
 maintain and develop this tool together.
 
 If you believe that you have identified a potential vulnerability in the code base,
-please report this promptly to [[email protected]](mailto:[email protected]). Please describe the problem in as
-much detail as possible, ideally with examples. Each report will be dealt with on a
-case-by-case basis. You will receive regular communication on the resolution
-and progress of your report.
+please report this promptly to [[email protected]](mailto:[email protected]). Please
+describe the problem in as much detail as possible, ideally with examples. Each report
+will be dealt with on a case-by-case basis. You will receive regular communication on
+the resolution and progress of your report.