Create SECURITY.md

Author: driesvints

SECURITY.md

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+# Security Policy
+
+**PLEASE DON'T DISCLOSE SECURITY-RELATED ISSUES PUBLICLY, [SEE BELOW](#reporting-a-vulnerability).**
+
+## Supported Versions
+
+Only the latest major version receives security fixes.
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, please send an email to Dries Vints at <dries@vints.be>. All security vulnerabilities will be promptly addressed.