Create SECURITY.md

Author: nfrasser

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.1.x   | :white_check_mark: |
+| 4.0.x   | :x:                |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+Please use GitHub's [private vulnerability reporting]([url](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability)) feature to submit a report at [github.com/nfrasser/linkifyjs/security](https://github.com/nfrasser/linkifyjs/security)