Updated circleci config to trigger release for releases prefixed with a 'v' character.

Author: rfmeier

.circleci/config.yml

@@ -203,4 +203,4 @@ workflows:
             branches:
               ignore: /.*/
             tags:
-              only: /^(\d+)\.(\d+)(\.\d+)?$/
+              only: /^(v)?(\d+)\.(\d+)(\.\d+)?$/