"Mixed Content" error using HTTPS

[jmckenna]

Error message:

Mixed Content: The page at 'https://mapserver.org/index.html' was loaded over HTTPS, but requested an insecure resource 'http://tylerlh.github.io/github-latest-commits-widget/?username=mapserver&repo=mapserver&limit=10'. This request has been blocked; the content must be served over HTTPS.

[jmckenna]

referrer page's code:

<iframe src="https://tylerlh.github.com/github-latest-commits-widget/?username=mapserver&repo=mapserver&limit=10"
  allowtransparency="true" frameborder="0" scrolling="yes" width="230px" height="200px"></iframe>