Change case of security.md (#104)

Author: muneebahmed10

SECURITY.md

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+## Reporting a Vulnerability
+
+If you discover a potential security issue in this project, we ask that you notify AWS/Amazon Security
+via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/) or directly via email to [email protected].
+Please do **not** create a public github issue.