Use https links in CONTRIBUTING.md

CONTRIBUTING.md

@@ -51,11 +51,11 @@ [email protected] with any additional questions or comments.
 
 
 ## Security issue notifications
-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/). Please do **not** create a public github issue.
+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/). Please do **not** create a public github issue.
 
 
 ## Licensing
 
 See the [LICENSE](https://github.com/amazon-ion/ion-java/blob/master/LICENSE) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
 
-We may ask you to sign a [Contributor License Agreement (CLA)](http://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.
+We may ask you to sign a [Contributor License Agreement (CLA)](https://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.