Revise security policy and supported versions

Author: wolpert

SECURITY.md

@@ -0,0 +1,15 @@
+# Security Policy
+
+## Supported Versions
+
+The following are the supported versions of the various libraries within this project:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.0.x   | :white_check_mark: |
+| < 3.0   | :x:                |
+
+## Reporting a Vulnerability
+
+The best way to report a vulnerability is to use my published email address shown at my 
+[github account](https://github.com/wolpert)