Renamed to uppercase. (#22)

Author: sarenameas

security.md renamed to SECURITY.md

@@ -1,5 +1,5 @@
 ## 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](http://aws.amazon.com/security/vulnerability-reporting/) or directly via email to aws-security@amazon.com.
+via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/) or directly via email to aws-security@amazon.com.
 Please do **not** create a public github issue.