Create SECURITY.md

Author: mpalmer

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security updates will be made to the latest released version.
+
+## Reporting a Vulnerability
+
+If you have found a vulnerability in this codebase, nice one!
+Please report it by creating [a new draft advisory](https://github.com/mpalmer/git-version-bump/security/advisories/new), and we'll take it from there.