Create SECURITY.md

SECURITY.md

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+Security Policy
+===============
+
+| Version | Security support   | Bug support        |
+| ------- | ------------------ | ------------------ |
+| 3.x.x   | :heavy_check_mark: | :heavy_check_mark: |
+| 2.x.x   | :heavy_check_mark: | :x:                |
+| 1.x.x   | :x:                | :x:                |
+| 0.x.x   | :x:                | :x:                |
+
+To reporting a vulnerability send me an email at [email protected] and we will talk about how to address it.