Change circle tag filter to allow -beta

Author: rdbatch

.circleci/config.yml

@@ -43,12 +43,12 @@ workflows:
             branches:
               ignore: /.*/
             tags:
-              only: /^\d+\.\d+\.\d+$/
+              only: /^\d+\.\d+\.\d+[\-a-z]*$/
       - deploy:
           requires:
             - build
           filters:
             branches:
               only: master
             tags:
-              only: /^\d+\.\d+\.\d+$/
+              only: /^\d+\.\d+\.\d+[\-a-z]*$/