:beam-website:testWebsite fails due to validation of ssl cert for globenewswire.com

Failure when running: 

./gradlew :beam-website:testWebsite

Error includes:

• ./generated-content/blog/2017/02/01/graduation-media-recap.html

  *  External link https://globenewswire.com/news-release/2017/01/10/904692/0/en/The-Apache-Software-Foundation-Announces-Apache-Beam-as-a-Top-Level-Project.html failed: response code 0 means something's wrong.

             It's possible libcurl couldn't connect to the server or perhaps the request timed out.

             Sometimes, making too many requests at once also breaks things.

             Either way, the return message (if any) from the server is: Peer certificate cannot be authenticated with given CA certificates

rake aborted!

HTML-Proofer found 1 failure!

Also fails when running:

curl -v https://globenewswire.com/news-release/2017/01/10/904692/0/en/The-Apache-Software-Foundation-Announces-Apache-Beam-as-a-Top-Level-Project.html

Works fine opening in a browser.